Cyanide poisoning
Encyclopedia
Cyanide poisoning occurs when a living organism is exposed to a compound that produces cyanide
Cyanide
A cyanide is a chemical compound that contains the cyano group, -C≡N, which consists of a carbon atom triple-bonded to a nitrogen atom. Cyanides most commonly refer to salts of the anion CN−. Most cyanides are highly toxic....

 ions (CN) when dissolved in water. Common poisonous cyanide compounds include hydrogen cyanide gas and the crystalline solids potassium cyanide
Potassium cyanide
Potassium cyanide is an inorganic compound with the formula KCN. This colorless crystalline compound, similar in appearance to sugar, is highly soluble in water. Most KCN is used in gold mining, organic synthesis, and electroplating. Smaller applications include jewelry for chemical gilding and...

 and sodium cyanide
Sodium cyanide
Sodium cyanide is an inorganic compound with the formula NaCN. This highly toxic colorless salt is used mainly in gold mining but has other niche applications...

. The cyanide ion halts cellular respiration by inhibiting an enzyme in mitochondria called Cytochrome C Oxidase
Cytochrome c oxidase
The enzyme cytochrome c oxidase or Complex IV is a large transmembrane protein complex found in bacteria and the mitochondrion.It is the last enzyme in the respiratory electron transport chain of mitochondria located in the mitochondrial membrane...

.

Acute poisoning

Cyanide makes the cells of an organism unable to use oxygen, primarily through the inhibition of cytochrome c oxidase
Cytochrome c oxidase
The enzyme cytochrome c oxidase or Complex IV is a large transmembrane protein complex found in bacteria and the mitochondrion.It is the last enzyme in the respiratory electron transport chain of mitochondria located in the mitochondrial membrane...

. Inhalation of high concentrations of cyanide causes a coma
Coma
In medicine, a coma is a state of unconsciousness, lasting more than 6 hours in which a person cannot be awakened, fails to respond normally to painful stimuli, light or sound, lacks a normal sleep-wake cycle and does not initiate voluntary actions. A person in a state of coma is described as...

 with seizures, apnea
Apnea
Apnea, apnoea, or apnœa is a term for suspension of external breathing. During apnea there is no movement of the muscles of respiration and the volume of the lungs initially remains unchanged...

, and cardiac arrest
Cardiac arrest
Cardiac arrest, is the cessation of normal circulation of the blood due to failure of the heart to contract effectively...

, with death following in a matter of minutes. At lower doses, loss of consciousness may be preceded by general weakness, giddiness, headache
Headache
A headache or cephalalgia is pain anywhere in the region of the head or neck. It can be a symptom of a number of different conditions of the head and neck. The brain tissue itself is not sensitive to pain because it lacks pain receptors. Rather, the pain is caused by disturbance of the...

s, vertigo
Vertigo (medical)
Vertigo is a type of dizziness, where there is a feeling of motion when one is stationary. The symptoms are due to a dysfunction of the vestibular system in the inner ear...

, confusion, and perceived difficulty in breathing. At the first stages of unconsciousness, breathing is often sufficient or even rapid, although the state of the victim progresses towards a deep coma, sometimes accompanied by pulmonary edema
Pulmonary edema
Pulmonary edema , or oedema , is fluid accumulation in the air spaces and parenchyma of the lungs. It leads to impaired gas exchange and may cause respiratory failure...

, and finally cardiac arrest. Skin color goes pink from cyanide-hemoglobin complexes. A fatal dose for humans can be as low as 1.5 mg/kg body weight. Blood cyanide concentrations may be measured as a means of confirming the diagnosis in hospitalized patients or to assist in the forensic investigation of a criminal poisoning. Cyanide toxicity can occur following ingestion of amygdalin
Amygdalin
Amygdalin , C20H27NO11, is a glycoside initially isolated from the seeds of the tree Prunus dulcis, also known as bitter almonds, by Pierre-Jean Robiquet...

 (found in almonds and apricot kernels and marketed as an alternative cancer cure), prolonged administration of nitroprusside, and after exposure to gases produced by the combustion of synthetic materials.

Chronic exposure

In addition to pesticide
Pesticide
Pesticides are substances or mixture of substances intended for preventing, destroying, repelling or mitigating any pest.A pesticide may be a chemical unicycle, biological agent , antimicrobial, disinfectant or device used against any pest...

 and insecticide
Insecticide
An insecticide is a pesticide used against insects. They include ovicides and larvicides used against the eggs and larvae of insects respectively. Insecticides are used in agriculture, medicine, industry and the household. The use of insecticides is believed to be one of the major factors behind...

, cyanide is contained in tobacco smoke, smoke from building fires and some foods, like almonds, apricot kernel, cassava, yucca, manioc
Cassava
Cassava , also called yuca or manioc, a woody shrub of the Euphorbiaceae native to South America, is extensively cultivated as an annual crop in tropical and subtropical regions for its edible starchy tuberous root, a major source of carbohydrates...

, and apple seeds. Vitamin B12
Vitamin B12
Vitamin B12, vitamin B12 or vitamin B-12, also called cobalamin, is a water-soluble vitamin with a key role in the normal functioning of the brain and nervous system, and for the formation of blood. It is one of the eight B vitamins...

 may reduce the negative effects of chronic exposure, and a deficiency can lead to negative health effects following exposure.

Exposure to lower levels of cyanide over a long period (e.g., after use of cassava
Cassava
Cassava , also called yuca or manioc, a woody shrub of the Euphorbiaceae native to South America, is extensively cultivated as an annual crop in tropical and subtropical regions for its edible starchy tuberous root, a major source of carbohydrates...

 roots as a primary food source in tropical Africa) results in increased blood cyanide levels, which can result in weakness and a variety of symptoms, including permanent paralysis
Paralysis
Paralysis is loss of muscle function for one or more muscles. Paralysis can be accompanied by a loss of feeling in the affected area if there is sensory damage as well as motor. A study conducted by the Christopher & Dana Reeve Foundation, suggests that about 1 in 50 people have been diagnosed...

, nervous lesions, hypothyroidism, and miscarriages. Other effects include mild liver and kidney damages.

Treatment of poisoning and antidotes

The United States
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 standard cyanide antidote
Antidote
An antidote is a substance which can counteract a form of poisoning. The term ultimately derives from the Greek αντιδιδοναι antididonai, "given against"....

 kit first uses a small inhaled dose of amyl nitrite
Amyl nitrite
Amyl nitrite is the chemical compound with the formula C5H11ONO. A variety of isomers are known, but they all feature an amyl group attached to the nitrito functional group. The alkyl group is unreactive and the chemical and biological properties are mainly due to the nitrite group...

, followed by intravenous sodium nitrite
Sodium nitrite
Sodium nitrite is the inorganic compound with the chemical formula NaNO2. It is a white to slight yellowish crystalline powder that is very soluble in water and is hygroscopic...

, followed by intravenous sodium thiosulfate
Sodium thiosulfate
Sodium thiosulfate , also spelled sodium thiosulphate, is a colorless crystalline compound that is more familiar as the pentahydrate, Na2S2O3•5H2O, an efflorescent, monoclinic crystalline substance also called sodium hyposulfite or “hypo.”...

. Hydroxocobalamin
Hydroxocobalamin
Hydroxocobalamin is a natural form, or vitamer, of vitamin B12, a basic member of the cobalamin family of compounds. Hydroxocobalamin is the form of vitamin B12 produced by many bacteria which are used to produce the vitamin commercially. Like other forms of vitamin B12, hydroxocobalamin has an...

 is newly approved in the US and is available in Cyanokit antidote kits. Alternative methods of treating cyanide intoxication are used in other countries.
Agent Description
Nitrite
Nitrite
The nitrite ion has the chemical formula NO2−. The anion is symmetric with equal N-O bond lengths and a O-N-O bond angle of ca. 120°. On protonation the unstable weak acid nitrous acid is produced. Nitrite can be oxidised or reduced, with product somewhat dependent on the oxidizing/reducing agent...

s and sodium thiosulfate
Sodium thiosulfate
Sodium thiosulfate , also spelled sodium thiosulphate, is a colorless crystalline compound that is more familiar as the pentahydrate, Na2S2O3•5H2O, an efflorescent, monoclinic crystalline substance also called sodium hyposulfite or “hypo.”...

The nitrites oxidize some of the hemoglobin's iron from the ferrous
Ferrous
Ferrous , in chemistry, indicates a divalent iron compound , as opposed to ferric, which indicates a trivalent iron compound ....

 state to the ferric
Ferric
Ferric refers to iron-containing materials or compounds. In chemistry the term is reserved for iron with an oxidation number of +3, also denoted iron or Fe3+. On the other hand, ferrous refers to iron with oxidation number of +2, denoted iron or Fe2+...

 state, converting the hemoglobin into methemoglobin. (Treatment with nitrites is not innocuous as methemoglobin cannot carry oxygen, and methemoglobinemia needs to be treated in turn with methylene blue
Methylene blue
Methylene blue is a heterocyclic aromatic chemical compound with the molecular formula C16H18N3SCl. It has many uses in a range of different fields, such as biology and chemistry. At room temperature it appears as a solid, odorless, dark green powder, that yields a blue solution when dissolved in...

). Cyanide preferentially bonds to methemoglobin rather than the cytochrome oxidase
Oxidase
An oxidase is any enzyme that catalyzes an oxidation-reduction reaction involving molecular oxygen as the electron acceptor. In these reactions, oxygen is reduced to water or hydrogen peroxide ....

, converting methemoglobin into cyanmethemoglobin. In the last step, the intravenous sodium thiosulfate converts the cyanmethemoglobin to thiocyanate
Thiocyanate
Thiocyanate is the anion [SCN]−. It is the conjugate base of thiocyanic acid. Common derivatives include the colourless salts potassium thiocyanate and sodium thiocyanate. Organic compounds containing the functional group SCN are also called thiocyanates...

, sulfite
Sulfite
Sulfites are compounds that contain the sulfite ion SO. The sulfite ion is the conjugate base of bisulfite. Although the acid itself is elusive, its salts are widely used.-Structure:...

, and hemoglobin. The thiocyanate is then excreted in the urine.
Hydroxocobalamin
Hydroxocobalamin
Hydroxocobalamin is a natural form, or vitamer, of vitamin B12, a basic member of the cobalamin family of compounds. Hydroxocobalamin is the form of vitamin B12 produced by many bacteria which are used to produce the vitamin commercially. Like other forms of vitamin B12, hydroxocobalamin has an...

Hydroxocobalamin
Hydroxocobalamin
Hydroxocobalamin is a natural form, or vitamer, of vitamin B12, a basic member of the cobalamin family of compounds. Hydroxocobalamin is the form of vitamin B12 produced by many bacteria which are used to produce the vitamin commercially. Like other forms of vitamin B12, hydroxocobalamin has an...

, a form (or vitamer
Vitamer
A vitamer of a particular vitamin is any of a number of chemical substances, each of which shows vitamin activity. Very commonly each "vitamin" is not a single chemical, but rather multiple chemical substances called vitamers, each of which is defined by its different biological activity.For...

) of vitamin B12
Vitamin B12
Vitamin B12, vitamin B12 or vitamin B-12, also called cobalamin, is a water-soluble vitamin with a key role in the normal functioning of the brain and nervous system, and for the formation of blood. It is one of the eight B vitamins...

 made by bacteria, and sometimes denoted vitamin B12a, is used to bind cyanide to form the harmless cyanocobalamin
Cyanocobalamin
Cyanocobalamin is an especially common vitamer of the vitamin B12 family. It is the most famous vitamer of the family, because it is, in chemical terms, the most air-stable...

 form of vitamin B12. Hydroxocobalamin
Hydroxocobalamin
Hydroxocobalamin is a natural form, or vitamer, of vitamin B12, a basic member of the cobalamin family of compounds. Hydroxocobalamin is the form of vitamin B12 produced by many bacteria which are used to produce the vitamin commercially. Like other forms of vitamin B12, hydroxocobalamin has an...

 is newly approved in the US and is available in Cyanokit antidote kits. Cyanocobalamin is then eliminated through the urine. Hydroxocobalamin works both within the intravascular space and within the cells to combat cyanide intoxication. This versatility contrasts with methemoglobin, which acts only within the vascular space as an antidote. Administration of sodium thiosulfate improves the ability of the hydroxocobalamin to detoxify cyanide poisoning. This treatment is considered so effective and innocuous that it is administered routinely in Paris to victims of smoke inhalation to detoxify any associated cyanide intoxication. However it is relatively expensive and not universally available.
4-Dimethylaminophenol
4-Dimethylaminophenol
4-Dimethylaminophenol is an aromatic compound containing both phenol and amine functional groups. It has the molecular formula C8H11NO.-Uses:4-Dimethylaminophenol has been used as an antidote for cyanide poisoning....

4-Dimethylaminophenol
4-Dimethylaminophenol
4-Dimethylaminophenol is an aromatic compound containing both phenol and amine functional groups. It has the molecular formula C8H11NO.-Uses:4-Dimethylaminophenol has been used as an antidote for cyanide poisoning....

 (4-DMAP) has been proposed in Germany
Germany
Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

 as a more rapid antidote than nitrites with (reportedly) lower toxicity. 4-DMAP is used currently by the German military and by the civilian population. In humans, intravenous injection of 3 mg/kg of 4-DMAP produces 35 percent methemoglobin levels within 1 minute. Reportedly, 4-DMAP is part of the US Cyanokit, while it is not part of the German Cyanokit due to side effects (e. g. hemolysis
Hemolysis
Hemolysis —from the Greek meaning "blood" and meaning a "loosing", "setting free" or "releasing"—is the rupturing of erythrocytes and the release of their contents into surrounding fluid...

).
Dicobalt edetate
Dicobalt edetate
Dicobalt edetate is the coordination compound with the approximate formula Co26.Solutions of this solid have been used in Europe as an antidote to cyanide poisoning.It is a derivative of the amino acid ethylenediaminetetraacetate....

Cobalt
Cobalt
Cobalt is a chemical element with symbol Co and atomic number 27. It is found naturally only in chemically combined form. The free element, produced by reductive smelting, is a hard, lustrous, silver-gray metal....

 salt
Salt
In chemistry, salts are ionic compounds that result from the neutralization reaction of an acid and a base. They are composed of cations and anions so that the product is electrically neutral...

s have also been demonstrated as effective in binding cyanide. One current cobalt-based antidote available in Europe is dicobalt edetate
Dicobalt edetate
Dicobalt edetate is the coordination compound with the approximate formula Co26.Solutions of this solid have been used in Europe as an antidote to cyanide poisoning.It is a derivative of the amino acid ethylenediaminetetraacetate....

 or dicobalt-EDTA, sold as Kelocyanor. This agent chelates cyanide as the cobalticyanide. This drug provides an antidote effect more quickly than formation of methemoglobin, but a clear superiority to methemoglobin formation has not been demonstrated. Cobalt complexes
Complex (chemistry)
In chemistry, a coordination complex or metal complex, is an atom or ion , bonded to a surrounding array of molecules or anions, that are in turn known as ligands or complexing agents...

 are quite toxic, and there have been accidents reported in the UK
United Kingdom
The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

 where patients have been given dicobalt-EDTA by mistake based on a false diagnoses of cyanide poisoning.
Glucose
Glucose
Glucose is a simple sugar and an important carbohydrate in biology. Cells use it as the primary source of energy and a metabolic intermediate...

Evidence from animal experiments suggests that coadministration of glucose
Glucose
Glucose is a simple sugar and an important carbohydrate in biology. Cells use it as the primary source of energy and a metabolic intermediate...

 protects against cobalt toxicity associated with the antidote agent dicobalt edetate. For this reason, glucose is often administered alongside this agent (e.g. in the formulation 'Kelocyanor').
It has also been anecdotally suggested that glucose is itself an effective counteragent to cyanide, reacting with it to form less toxic compounds that can be eliminated by the body. One theory on the apparent immunity of Grigory Rasputin to cyanide was that his killers put the poison in sweet pastries and madeira wine
Madeira wine
Madeira is a fortified Portuguese wine made in the Madeira Islands. Some wines produced in small quantities in California and Texas are also referred to as "Madeira", or "Madera", although those wines do not conform to the EU PDO regulations...

, both of which are rich in sugar; thus, Rasputin would have been administered the poison together with massive quantities of antidote. One study found a reduction in cyanide toxicity in mice when the cyanide was first mixed with glucose. However, as yet glucose on its own is not an officially acknowledged antidote to cyanide poisoning.
3-Mercaptopyruvate prodrugs Antidotes for the therapeutic management of cyanide poisoning, especially in the U.S., have relied mainly on the enzyme rhodanese (thiosulfate/cyanide sulfurtransferase, EC 2.8.1.1) for detoxification. This enzyme uses thiosulfate to form an activated-sulfane complex, which reacts with cyanide to form the less-toxic thiocyanate, that is excreted in the urine. Rhodanase is concentrated in the liver and kidneys where it is found in the mitochondrial matrix, a site of low accessibility for ionized, inorganic species, such as thiosulfate. This compartmentation of rhodanase in mammalian tissues leaves major targets of cyanide lethality, namely, the heart and central nervous system unprotected. (Rhodanase is also found in red blood cells, but its relative function has not been clarified.)

Researchers at the University of Minnesota are exploiting a different cyanide metabolic pathway in their antidote program: 3-mercaptopyruvate sulfur transferase (3-MPST, EC 2.8.1.2) which is more widely distributed in mammalian tissues than rhodanase. Analogous to rhodanase, 3-MPST uses its substrate to convert cyanide to thiocyanate, but instead of thiosulfate, the natural substrate of 3-MPST is the cysteine catabolite, 3-mercaptopyruvate (3-MP). However, 3-MP is chemically unstable, and attempts at intravenous administration to counteract the toxicity of cyanide have been unsuccessful due to this instability. The Minnesota researchers have therefore developed an effective prodrug of 3-mercaptopyruvate that, when administered orally or parenterally, forms 3-MP. These cyanide antidotes are under advanced preclinical evaluation at the University of Minnesota
Oxygen therapy
Oxygen therapy
Oxygen therapy is the administration of oxygen as a medical intervention, which can be for a variety of purposes in both chronic and acute patient care...

Oxygen therapy
Oxygen therapy
Oxygen therapy is the administration of oxygen as a medical intervention, which can be for a variety of purposes in both chronic and acute patient care...

 is not a cure in its own right, however the human liver is capable of metabolizing cyanide quickly in low doses (smokers breathe in hydrogen cyanide, but it is such a small amount and metabolized so fast that it does not accumulate
Accumulation
Accumulation may refer to:* Accumulation: None, a 2002 lo-fi album* Capital accumulation, the gathering of objects of value* Glacier ice accumulation, an element in the glacier mass balance formula...

). Therefore if the patient received a low dose and can be kept comfortable with just oxygen alone, then the liver can be left to destroy the cyanide.


The International Programme on Chemical Safety
International Programme on Chemical Safety
The International Programme on Chemical Safety was formed in 1980 and is a collaboration between three United Nations bodies—the World Health Organization, the International Labour Organization and the United Nations Environment Programme to establish the scientific basis for safe use of...

 issued a survey (IPCS/CEC Evaluation of Antidotes Series) that lists the following antidotal agents and their effects: oxygen, sodium thiosulfate, amyl nitrite, sodium nitrite, 4-dimethylaminophenol, hydroxocobalamin, and dicobalt edetate ('Kelocyanor'), as well as several others. Other commonly-recommended antidotes are 'solutions A and B' (a solution of ferrous sulfate in aqueous citric acid
Citric acid
Citric acid is a weak organic acid. It is a natural preservative/conservative and is also used to add an acidic, or sour, taste to foods and soft drinks...

, and aqueous sodium carbonate
Sodium carbonate
Sodium carbonate , Na2CO3 is a sodium salt of carbonic acid. It most commonly occurs as a crystalline heptahydrate, which readily effloresces to form a white powder, the monohydrate. Sodium carbonate is domestically well-known for its everyday use as a water softener. It can be extracted from the...

) and amyl nitrite
Amyl nitrite
Amyl nitrite is the chemical compound with the formula C5H11ONO. A variety of isomers are known, but they all feature an amyl group attached to the nitrito functional group. The alkyl group is unreactive and the chemical and biological properties are mainly due to the nitrite group...

.

The UK Health and Safety Executive
Health and Safety Executive
The Health and Safety Executive is a non-departmental public body in the United Kingdom. It is the body responsible for the encouragement, regulation and enforcement of workplace health, safety and welfare, and for research into occupational risks in England and Wales and Scotland...

 (HSE) has recommended against the use of solutions A and B because of their limited shelf life, potential to cause iron poisoning, and limited applicability (effective only in cases of cyanide ingestion, whereas the main modes of poisoning are inhalation and skin contact). The HSE has also questioned the usefulness of amyl nitrite due to storage/availability problems, risk of abuse, and lack of evidence of significant benefits. It also states that the availability of Kelocyanor at the workplace may mislead doctors into treating a patient for cyanide poisoning when this is an erroneous diagnosis. The HSE no longer recommends a particular cyanide antidote. Qualified UK first aid
First aid
First aid is the provision of initial care for an illness or injury. It is usually performed by non-expert, but trained personnel to a sick or injured person until definitive medical treatment can be accessed. Certain self-limiting illnesses or minor injuries may not require further medical care...

ers are now only permitted to apply oxygen therapy
Oxygen therapy
Oxygen therapy is the administration of oxygen as a medical intervention, which can be for a variety of purposes in both chronic and acute patient care...

 using a bag valve mask
Bag valve mask
A bag valve mask is a hand-held device used to provide positive pressure ventilation to a patient who is not breathing or who is breathing inadequately. The device is a normal part of a resuscitation kit for trained professionals, such as ambulance crew...

, providing they have been trained in its usage.
  • Hydrogen cyanide has been used for judicial execution in some states of the United States in gas chamber
    Gas chamber
    A gas chamber is an apparatus for killing humans or animals with gas, consisting of a sealed chamber into which a poisonous or asphyxiant gas is introduced. The most commonly used poisonous agent is hydrogen cyanide; carbon dioxide and carbon monoxide have also been used...

    s dedicated to that purpose. The State of California so executed Caryl Chessmann.
  • Some notable persons who committed suicide by cyanides (either cyanide salt or hydrogen cyanide) are Eva Braun
    Eva Braun
    Eva Anna Paula Hitler was the longtime companion of Adolf Hitler and, for less than 40 hours, his wife. Braun met Hitler in Munich, when she was 17 years old, while working as an assistant and model for his personal photographer and began seeing him often about two years later...

    , Wallace Carothers
    Wallace Carothers
    Wallace Hume Carothers was an American chemist, inventor and the leader of organic chemistry at DuPont, credited with the invention of nylon....

    , Odilo Globocnik
    Odilo Globocnik
    Odilo Lotario Globocnik was a prominent Austrian Nazi and later an SS leader. He was an acquaintance of Adolf Eichmann, who played a major role in the extermination of Jews and others during the Holocaust...

    , Joseph Goebbels
    Joseph Goebbels
    Paul Joseph Goebbels was a German politician and Reich Minister of Propaganda in Nazi Germany from 1933 to 1945. As one of Adolf Hitler's closest associates and most devout followers, he was known for his zealous oratory and anti-Semitism...

    , Hermann Göring
    Hermann Göring
    Hermann Wilhelm Göring, was a German politician, military leader, and a leading member of the Nazi Party. He was a veteran of World War I as an ace fighter pilot, and a recipient of the coveted Pour le Mérite, also known as "The Blue Max"...

    , Heinrich Himmler
    Heinrich Himmler
    Heinrich Luitpold Himmler was Reichsführer of the SS, a military commander, and a leading member of the Nazi Party. As Chief of the German Police and the Minister of the Interior from 1943, Himmler oversaw all internal and external police and security forces, including the Gestapo...

    , Adolf Hitler
    Adolf Hitler
    Adolf Hitler was an Austrian-born German politician and the leader of the National Socialist German Workers Party , commonly referred to as the Nazi Party). He was Chancellor of Germany from 1933 to 1945, and head of state from 1934 to 1945...

     (in combination with a gunshot), Günther von Kluge
    Günther von Kluge
    Günther Adolf Ferdinand “Hans” von Kluge was a German military leader. He was born in Posen into a Prussian military family. Kluge rose to the rank of Field Marshal in the Wehrmacht. He was also a recipient of the Knight's Cross of the Iron Cross with Oak Leaves and Swords...

    , Erwin Rommel
    Erwin Rommel
    Erwin Johannes Eugen Rommel , popularly known as the Desert Fox , was a German Field Marshal of World War II. He won the respect of both his own troops and the enemies he fought....

    , Alan Turing
    Alan Turing
    Alan Mathison Turing, OBE, FRS , was an English mathematician, logician, cryptanalyst, and computer scientist. He was highly influential in the development of computer science, providing a formalisation of the concepts of "algorithm" and "computation" with the Turing machine, which played a...

     and the Liberation Tigers of Tamil Eelam
    Liberation Tigers of Tamil Eelam
    The Liberation Tigers of Tamil Eelam was a separatist militant organization formerly based in northern Sri Lanka. Founded in May 1976 by Vellupillai Prabhakaran, it waged a violent secessionist and nationalist campaign to create an independent state in the north and east of Sri Lanka for Tamil...

    .
  • The mass suicide/murder of The People's Temple in Jonestown
    Jonestown
    Jonestown was the informal name for the Peoples Temple Agricultural Project, an intentional community in northwestern Guyana formed by the Peoples Temple led by Jim Jones. It became internationally notorious when, on November 18, 1978, 918 people died in the settlement as well as in a nearby...

     was accomplished with cyanide poisoning.

Gas chambers

  • Hydrogen cyanide gas was the agent used by Nazi Germany for mass murder in some gas chamber
    Gas chamber
    A gas chamber is an apparatus for killing humans or animals with gas, consisting of a sealed chamber into which a poisonous or asphyxiant gas is introduced. The most commonly used poisonous agent is hydrogen cyanide; carbon dioxide and carbon monoxide have also been used...

    s during the Holocaust
    The Holocaust
    The Holocaust , also known as the Shoah , was the genocide of approximately six million European Jews and millions of others during World War II, a programme of systematic state-sponsored murder by Nazi...

    . It was released from Zyklon B
    Zyklon B
    Zyklon B was the trade name of a cyanide-based pesticide infamous for its use by Nazi Germany to kill human beings in gas chambers of extermination camps during the Holocaust. The "B" designation indicates one of two types of Zyklon...

     pellets, which were a commercial biocide
    Biocide
    A biocide is a chemical substance or microorganism which can deter, render harmless, or exert a controlling effect on any harmful organism by chemical or biological means. Biocides are commonly used in medicine, agriculture, forestry, and industry...

    .
  • Hydrogen cyanide gas has also been used for judicial execution in some states of the United States, where cyanide was generated by reaction between potassium cyanide
    Potassium cyanide
    Potassium cyanide is an inorganic compound with the formula KCN. This colorless crystalline compound, similar in appearance to sugar, is highly soluble in water. Most KCN is used in gold mining, organic synthesis, and electroplating. Smaller applications include jewelry for chemical gilding and...

     dropped into a compartment containing sulfuric acid
    Sulfuric acid
    Sulfuric acid is a strong mineral acid with the molecular formula . Its historical name is oil of vitriol. Pure sulfuric acid is a highly corrosive, colorless, viscous liquid. The salts of sulfuric acid are called sulfates...

    , directly below the chair in the gas chamber.

War

Cyanides were stockpiled in both the Soviet
Soviet Union
The Soviet Union , officially the Union of Soviet Socialist Republics , was a constitutionally socialist state that existed in Eurasia between 1922 and 1991....

 and the United States chemical weapons arsenals in the 1950s and 1960s. However, as a military agent, hydrogen cyanide was not considered very effective, since it is lighter than air and needs a significant dose to incapacitate or kill.

Although there have been no verified instances of its use as a weapon, hydrogen cyanide may have been employed by Iraq
Iraq
Iraq ; officially the Republic of Iraq is a country in Western Asia spanning most of the northwestern end of the Zagros mountain range, the eastern part of the Syrian Desert and the northern part of the Arabian Desert....

 in the Halabja poison gas attack
Halabja poison gas attack
The Halabja poison gas attack , also known as Halabja massacre or Bloody Friday, was a genocidal massacre against the Kurdish people that took place on March 16, 1988, during the closing days of the Iran–Iraq War, when chemical weapons were used by the Iraqi government forces in the Kurdish town of...

 against the Kurd
Kürd
Kürd or Kyurd or Kyurt may refer to:*Kürd Eldarbəyli, Azerbaijan*Kürd Mahrızlı, Azerbaijan*Kürd, Goychay, Azerbaijan*Kürd, Jalilabad, Azerbaijan*Kürd, Qabala, Azerbaijan*Qurdbayram, Azerbaijan...

s in the 1980s under Saddam Hussein
Saddam Hussein
Saddam Hussein Abd al-Majid al-Tikriti was the fifth President of Iraq, serving in this capacity from 16 July 1979 until 9 April 2003...

. This information has not been verified.

Suicide

Cyanide salts are sometimes used as fast-acting suicide
Suicide
Suicide is the act of intentionally causing one's own death. Suicide is often committed out of despair or attributed to some underlying mental disorder, such as depression, bipolar disorder, schizophrenia, alcoholism, or drug abuse...

 devices. Cyanide is reputed to work faster on an empty stomach.
  • In February 1937, the Uruguayan short story writer Horacio Quiroga
    Horacio Quiroga
    Horacio Silvestre Quiroga Forteza was an Uruguayan playwright, poet, and short story writer....

     committed suicide drinking cyanide in a hospital at Buenos Aires
    Buenos Aires
    Buenos Aires is the capital and largest city of Argentina, and the second-largest metropolitan area in South America, after São Paulo. It is located on the western shore of the estuary of the Río de la Plata, on the southeastern coast of the South American continent...

    .
  • In 1937, the famous polymer chemist, Wallace Carothers
    Wallace Carothers
    Wallace Hume Carothers was an American chemist, inventor and the leader of organic chemistry at DuPont, credited with the invention of nylon....

    , committed suicide by cyanide.
  • Cyanide, in the form of pure liquid prussic acid (a historical name for hydrogen cyanide), was a favored suicide agent of the Third Reich. It was used to commit suicide by Erwin Rommel
    Erwin Rommel
    Erwin Johannes Eugen Rommel , popularly known as the Desert Fox , was a German Field Marshal of World War II. He won the respect of both his own troops and the enemies he fought....

     (1944), after being accused of conspiring against Hitler; Adolf Hitler
    Adolf Hitler
    Adolf Hitler was an Austrian-born German politician and the leader of the National Socialist German Workers Party , commonly referred to as the Nazi Party). He was Chancellor of Germany from 1933 to 1945, and head of state from 1934 to 1945...

    's wife, Eva Braun
    Eva Braun
    Eva Anna Paula Hitler was the longtime companion of Adolf Hitler and, for less than 40 hours, his wife. Braun met Hitler in Munich, when she was 17 years old, while working as an assistant and model for his personal photographer and began seeing him often about two years later...

     (1945); and by Nazi leaders Joseph Goebbels
    Joseph Goebbels
    Paul Joseph Goebbels was a German politician and Reich Minister of Propaganda in Nazi Germany from 1933 to 1945. As one of Adolf Hitler's closest associates and most devout followers, he was known for his zealous oratory and anti-Semitism...

     (1945), Heinrich Himmler
    Heinrich Himmler
    Heinrich Luitpold Himmler was Reichsführer of the SS, a military commander, and a leading member of the Nazi Party. As Chief of the German Police and the Minister of the Interior from 1943, Himmler oversaw all internal and external police and security forces, including the Gestapo...

     (1945), possibly Martin Bormann
    Martin Bormann
    Martin Ludwig Bormann was a prominent Nazi official. He became head of the Party Chancellery and private secretary to Adolf Hitler...

     (1945), and Hermann Göring
    Hermann Göring
    Hermann Wilhelm Göring, was a German politician, military leader, and a leading member of the Nazi Party. He was a veteran of World War I as an ace fighter pilot, and a recipient of the coveted Pour le Mérite, also known as "The Blue Max"...

     (1946). Adolf Hitler himself bit a cyanide capsule while simultaneously firing his pistol into his right temple. (1945).
  • It is speculated that, in 1954, Alan Turing
    Alan Turing
    Alan Mathison Turing, OBE, FRS , was an English mathematician, logician, cryptanalyst, and computer scientist. He was highly influential in the development of computer science, providing a formalisation of the concepts of "algorithm" and "computation" with the Turing machine, which played a...

     used an apple that had been injected with a solution of cyanide to commit suicide after being convicted of having a homosexual relationship—illegal at the time in the UK—and forced to undergo hormone treatment.
  • Jonestown
    Jonestown
    Jonestown was the informal name for the Peoples Temple Agricultural Project, an intentional community in northwestern Guyana formed by the Peoples Temple led by Jim Jones. It became internationally notorious when, on November 18, 1978, 918 people died in the settlement as well as in a nearby...

    , Guyana
    Guyana
    Guyana , officially the Co-operative Republic of Guyana, previously the colony of British Guiana, is a sovereign state on the northern coast of South America that is culturally part of the Anglophone Caribbean. Guyana was a former colony of the Dutch and of the British...

     was the site of a large mass suicide/murder, in which over 900 members of the Peoples Temple
    Peoples Temple
    Peoples Temple was a religious organization founded in 1955 by Jim Jones that, by the mid-1970s, included over a dozen locations in California including its headquarters in San Francisco...

     drank potassium cyanide-laced Flavor Aid
    Flavor Aid
    Flavor Aid is a non-carbonated soft drink beverage made by Jel Sert in West Chicago, Illinois, introduced in 1929. It is sold throughout the United States as an unsweetened powdered concentrate drink mix, similar to Kool-Aid drink mix.-Flavors:...

     in 1978.
  • Members of the Sri Lankan LTTE
    Liberation Tigers of Tamil Eelam
    The Liberation Tigers of Tamil Eelam was a separatist militant organization formerly based in northern Sri Lanka. Founded in May 1976 by Vellupillai Prabhakaran, it waged a violent secessionist and nationalist campaign to create an independent state in the north and east of Sri Lanka for Tamil...

     (Liberation Tigers of Tamil Eelam
    Liberation Tigers of Tamil Eelam
    The Liberation Tigers of Tamil Eelam was a separatist militant organization formerly based in northern Sri Lanka. Founded in May 1976 by Vellupillai Prabhakaran, it waged a violent secessionist and nationalist campaign to create an independent state in the north and east of Sri Lanka for Tamil...

    , whose insurgency lasted from 1983 to 2009), used to wear cyanide vials around their necks with the intention of committing suicide if captured by the government forces.

Murder

See:
  • Grigori Rasputin (1916)
  • Goebbels children
    Goebbels children
    The Goebbels children were the five daughters and one son born to Nazi propaganda minister Joseph Goebbels and his wife Magda Goebbels. The children, born between 1932 and 1940, were murdered by their parents in Berlin on May 1, 1945, the day both parents committed suicide.Magda Goebbels had an...

     (1945)
  • Tylenol murders
    1982 Chicago Tylenol murders
    The Chicago Tylenol murders occurred when seven people died after taking pain-relief medicine capsules that had been poisoned. The poisonings, code-named TYMURS by the Federal Bureau of Investigation, took place in late 1982 in the Chicago area of the United States.These poisonings involved...

     (1982)
  • Ronald Clark O'Bryan
    Ronald Clark O'Bryan
    Ronald Clark O'Bryan was a murderer from Deer Park, Texas , who was convicted of killing his eight-year-old son Timothy on Halloween, 1974 with cyanide-laced Giant Pixy Stix candy in order to claim life insurance money...

     (1984)

Terrorism

  • In 1995, a device was discovered in a restroom in the Kayabacho Tokyo
    Tokyo
    , ; officially , is one of the 47 prefectures of Japan. Tokyo is the capital of Japan, the center of the Greater Tokyo Area, and the largest metropolitan area of Japan. It is the seat of the Japanese government and the Imperial Palace, and the home of the Japanese Imperial Family...

     subway station, consisting of bags of sodium cyanide
    Sodium cyanide
    Sodium cyanide is an inorganic compound with the formula NaCN. This highly toxic colorless salt is used mainly in gold mining but has other niche applications...

     and sulfuric acid
    Sulfuric acid
    Sulfuric acid is a strong mineral acid with the molecular formula . Its historical name is oil of vitriol. Pure sulfuric acid is a highly corrosive, colorless, viscous liquid. The salts of sulfuric acid are called sulfates...

     with a remote controlled motor to rupture them in what was believed to be an attempt by the Aum Shinrikyo
    Aum Shinrikyo
    Aum Shinrikyo was a Japanese new religious movement. The group was founded by Shoko Asahara in 1984. The group gained international notoriety in 1995, when it carried out the Sarin gas attack on the Tokyo subway....

     cult
    Cult
    The word cult in current popular usage usually refers to a group whose beliefs or practices are considered abnormal or bizarre. The word originally denoted a system of ritual practices...

     to produce toxic amounts of hydrogen cyanide gas.
  • In 2003, Al Qaeda reportedly planned to release cyanide gas into the New York City Subway
    New York City Subway
    The New York City Subway is a rapid transit system owned by the City of New York and leased to the New York City Transit Authority, a subsidiary agency of the Metropolitan Transportation Authority and also known as MTA New York City Transit...

     system. The attack was reportedly aborted because there would not be enough casualties.

Homicide

  • In Agatha Christie
    Agatha Christie
    Dame Agatha Christie DBE was a British crime writer of novels, short stories, and plays. She also wrote romances under the name Mary Westmacott, but she is best remembered for her 66 detective novels and 14 short story collections , and her successful West End plays.According to...

    's And Then There Were None
    And Then There Were None
    And Then There Were None is a detective fiction novel by Agatha Christie, first published in the United Kingdom by the Collins Crime Club on 6 November 1939 under the title Ten Little Niggers which was changed by Dodd, Mead and Company in January 1940 because of the presence of a racial...

    , the first death occurs from cyanide poisoning.

  • In Agatha Christie
    Agatha Christie
    Dame Agatha Christie DBE was a British crime writer of novels, short stories, and plays. She also wrote romances under the name Mary Westmacott, but she is best remembered for her 66 detective novels and 14 short story collections , and her successful West End plays.According to...

    's Sparkling Cyanide
    Sparkling Cyanide
    Sparkling Cyanide is a work of detective fiction by Agatha Christie and first published in the US by Dodd, Mead and Company in February 1945 under the title of Remembered Death and in UK by the Collins Crime Club in the December of the same year under Christie's original title...

    (also entitled Remembered Death), based upon her Hercule Poirot
    Hercule Poirot
    Hercule Poirot is a fictional Belgian detective created by Agatha Christie. Along with Miss Marple, Poirot is one of Christie's most famous and long-lived characters, appearing in 33 novels and 51 short stories published between 1920 and 1975 and set in the same era.Poirot has been portrayed on...

     short story entitled "Yellow Iris", Rosemary and George Barton are poisoned by cyanide crystals.

  • In the Joseph Kesselring
    Joseph Kesselring
    Joseph Otto Kesselring was an American writer and playwright known best for his play Arsenic and Old Lace, written in 1939 and originally entitled "Bodies in Our Cellar." He was born in New York City to Henry and Frances Kesselring. His father's parents were immigrants from Germany. His mother was...

     play Arsenic and Old Lace
    Arsenic and Old Lace (play)
    Arsenic and Old Lace is a play by American playwright Joseph Kesselring, written in 1939. It has become best known through the film adaptation starring Cary Grant and directed by Frank Capra. The play was directed by Bretaigne Windust, and opened on January 10, 1941. On September 25, 1943, the...

    , two old ladies mix wine with arsenic
    Arsenic
    Arsenic is a chemical element with the symbol As, atomic number 33 and relative atomic mass 74.92. Arsenic occurs in many minerals, usually in conjunction with sulfur and metals, and also as a pure elemental crystal. It was first documented by Albertus Magnus in 1250.Arsenic is a metalloid...

    , cyanide and strychnine
    Strychnine
    Strychnine is a highly toxic , colorless crystalline alkaloid used as a pesticide, particularly for killing small vertebrates such as birds and rodents. Strychnine causes muscular convulsions and eventually death through asphyxia or sheer exhaustion...

     to use to kill old men.

  • Raymond Chandler
    Raymond Chandler
    Raymond Thornton Chandler was an American novelist and screenwriter.In 1932, at age forty-five, Raymond Chandler decided to become a detective fiction writer after losing his job as an oil company executive during the Depression. His first short story, "Blackmailers Don't Shoot", was published in...

     uses "a little potassium hydrocyanide" against private detective Philip Marlowe
    Philip Marlowe
    Philip Marlowe is a fictional character created by Raymond Chandler in a series of novels including The Big Sleep and The Long Goodbye. Marlowe first appeared under that name in The Big Sleep published in 1939...

     in "The Little Sister
    The Little Sister
    The Little Sister is a 1949 novel by Raymond Chandler, the fifth in his popular Philip Marlowe series. The story is set in late 1940s Los Angeles.-Plot summary:...

    " -- "merely relaxing".

  • In Hit Man: A Technical Manual for Independent Contractors
    Hit Man: A Technical Manual for Independent Contractors
    Hit Man: A Technical Manual for Independent Contractors is a book written under the pseudonym Rex Feral and published by Paladin Press in 1983. Paladin Press owner Peder Lund claimed, in an interview with 60 minutes, that the book started life as a detailed crime novel written by a Florida...

    by 'Rex Feral', the use of cyanide to poison a mark is explained in detail.

  • The Detective Conan manga/anime series has a large number of cases in which the victims are killed by cyanide, with all or most mentioning an 'almond scent' to describe it.

  • Yuka Nakagawa falls victim to accidental cyanide poisoning in Battle Royale
    Battle Royale
    thumb|260px|Cover of the 2009 expanded edition, ISBN 978-1-4215-2772-3 is a 1999 Japanese novel written by Koushun Takami. The story tells of schoolchildren who are forced to fight each other to the death....


  • Bishop Lilliman was killed by 'v', forcing the bishop to swallow a communion wafer poisoned with cyanide V for Vendetta
    V for Vendetta
    V for Vendetta is a ten-issue comic book series written by Alan Moore and illustrated mostly by David Lloyd, set in a dystopian future United Kingdom imagined from the 1980s to about the 1990s. A mysterious masked revolutionary who calls himself "V" works to destroy the totalitarian government,...


Suicide

  • In Agatha Christie's
    Agatha Christie
    Dame Agatha Christie DBE was a British crime writer of novels, short stories, and plays. She also wrote romances under the name Mary Westmacott, but she is best remembered for her 66 detective novels and 14 short story collections , and her successful West End plays.According to...

     novel The Hollow
    The Hollow
    The Hollow is a work of detective fiction by Agatha Christie and first published in the US by Dodd, Mead and Company in 1946 and in the UK by the Collins Crime Club in November of the same year. The US edition retailed at $2.50 and the UK edition at eight shillings and sixpence...

    , woman called Gerda Christow kills herself when she gets caught by murder of her husband.

  • In Anthony Trollope's
    Anthony Trollope
    Anthony Trollope was one of the most successful, prolific and respected English novelists of the Victorian era. Some of his best-loved works, collectively known as the Chronicles of Barsetshire, revolve around the imaginary county of Barsetshire...

     novel The Way We Live Now
    The Way We Live Now
    The Way We Live Now is a satirical novel published in London in 1875 by Anthony Trollope, after a popular serialisation. In 1872 Trollope returned to England from abroad and was appalled by the greed which was loose in the land. His scolding rebuke was his longest novel.Containing over a hundred...

    , the financier Augustus Melmotte commits suicide with prussic acid when he realizes that he is ruined.

  • In Oscar Wilde's
    Oscar Wilde
    Oscar Fingal O'Flahertie Wills Wilde was an Irish writer and poet. After writing in different forms throughout the 1880s, he became one of London's most popular playwrights in the early 1890s...

     novel The Picture of Dorian Gray
    The Picture of Dorian Gray
    The Picture of Dorian Gray is the only published novel by Oscar Wilde, appearing as the lead story in Lippincott's Monthly Magazine on 20 June 1890, printed as the July 1890 issue of this magazine...

    , actress Sibyl Vane dies from swallowing something with "either prussic acid or white lead
    White lead
    White lead is the chemical compound 2·Pb2. It was formerly used as an ingredient for lead paint and a cosmetic called Venetian Ceruse, because its opaque quality made it a good pigment. However, it tended to cause lead poisoning, and its use has been banned in most countries.White lead has been...

     in it".

  • In Ford Madox Ford
    Ford Madox Ford
    Ford Madox Ford was an English novelist, poet, critic and editor whose journals, The English Review and The Transatlantic Review, were instrumental in the development of early 20th-century English literature...

    's 1915 novel The Good Soldier
    The Good Soldier
    The Good Soldier: A Tale of Passion is a 1915 novel by English novelist Ford Madox Ford. It is set just before World War I and chronicles the tragedy of Edward Ashburnham, the soldier to whom the title refers, and his own seemingly perfect marriage and that of two American friends...

    , the narrator's wife commits suicide by drinking a flask of prussic acid disguised as amyl nitrite
    Amyl nitrite
    Amyl nitrite is the chemical compound with the formula C5H11ONO. A variety of isomers are known, but they all feature an amyl group attached to the nitrito functional group. The alkyl group is unreactive and the chemical and biological properties are mainly due to the nitrite group...

    .

  • Australian author Nevil Shute
    Nevil Shute
    Nevil Shute Norway was a popular British-Australian novelist and a successful aeronautical engineer. He used his full name in his engineering career, and 'Nevil Shute' as his pen name, in order to protect his engineering career from any potential negative publicity in connection with his novels.-...

    's 1957 novel about life after nuclear war, On the Beach, gives the scenario of the Australian government giving survivors free cyanide tablets to commit suicide rather than face death from radiation poisoning
    Radiation poisoning
    Acute radiation syndrome also known as radiation poisoning, radiation sickness or radiation toxicity, is a constellation of health effects which occur within several months of exposure to high amounts of ionizing radiation...

    .

  • In Phoenix Wright: Ace Attorney: Trials and Tribulations, the third case solved by the player involves a programmer who is murdered when potassium cyanide is slipped into his coffee at a restaurant.

  • In the James Bond
    James Bond
    James Bond, code name 007, is a fictional character created in 1953 by writer Ian Fleming, who featured him in twelve novels and two short story collections. There have been a six other authors who wrote authorised Bond novels or novelizations after Fleming's death in 1964: Kingsley Amis,...

     movies and novels, 00 agents are issued cyanide capsules for use in the event of capture by the enemy. James Bond is described as having thrown his away.

  • In the 2008 Doctor Who
    Doctor Who
    Doctor Who is a British science fiction television programme produced by the BBC. The programme depicts the adventures of a time-travelling humanoid alien known as the Doctor who explores the universe in a sentient time machine called the TARDIS that flies through time and space, whose exterior...

    episode The Unicorn and the Wasp
    The Unicorn and the Wasp
    "The Unicorn and the Wasp" is the 7th episode in the revised fourth series of the British science fiction television series Doctor Who, which was aired by BBC One on 17 May 2008 at 19:00. Perhaps due to its later broadcast, it received an overnight audience rating of 7.7 million, making it the...

    , the Doctor
    Tenth Doctor
    The Tenth Doctor is the tenth incarnation of the protagonist of the long-running BBC television science-fiction series Doctor Who. He is played by David Tennant, who appears in three series, as well as eight specials...

     is nearly poisoned by cyanide, but manages to metabolize it and detoxify himself using a combination of proteins, salt, and a shock, plus the advantage of his non-human anatomy.

  • In the film Unknown, Jürgen commits suicide by emptying a bag of sodium cyanide into his coffee, disguised as a packet of sugar.

  • In the film Captain America: The First Avenger
    Captain America: The First Avenger
    Captain America: The First Avenger is a 2011 American superhero film based on the Marvel Comics character Captain America. It is the fifth installment of the Marvel Cinematic Universe...

    , Heinz Kruger commits suicide by cyanide tablet upon being caught.

  • In the video game Penumbra: Black Plague
    Penumbra: Black Plague
    Penumbra: Black Plague is the second installment of the Penumbra series of episodic computer games developed by Swedish developer Frictional Games. The story continues from the previous episode, Penumbra: Overture, showing the protagonist Philip moving away from the abandoned mine setting of the...

    , staff members of the Archaic are issued cyanide capsules to commit suicide should they become infected.

  • In the My Chemical Romance
    My Chemical Romance
    My Chemical Romance is an American alternative rock band from New Jersey, formed in 2001. The band consists of lead vocalist Gerard Way, guitarists Ray Toro and Frank Iero, and bassist Mikey Way and have a diverse sound incorporating elements of punk, emo, glam metal, and progressive rock...

     song, "To The End," lyrics refer to suicide by cyanide poisoning: "Say goodbye to the hearts you break and all the cyanide you drank."

Other

  • In the film Jaws
    Jaws (film)
    Jaws is a 1975 American horror-thriller film directed by Steven Spielberg and based on Peter Benchley's novel of the same name. In the story, the police chief of Amity Island, a fictional summer resort town, tries to protect beachgoers from a giant man-eating great white shark by closing the beach,...

    , marine biologist Matt Hooper (Richard Dreyfuss
    Richard Dreyfuss
    Richard Stephen Dreyfuss is an American actor best known for starring in a number of film, television, and theater roles since the late 1960s, including the films American Graffiti, Jaws, Close Encounters of the Third Kind, The Goodbye Girl, Whose Life Is It Anyway?, Stakeout, Always, What About...

    ) uses sodium cyanide in an attempt to kill the shark.
  • Isaac Asimov
    Isaac Asimov
    Isaac Asimov was an American author and professor of biochemistry at Boston University, best known for his works of science fiction and for his popular science books. Asimov was one of the most prolific writers of all time, having written or edited more than 500 books and an estimated 90,000...

    's short story Hostess
    Hostess (short story)
    "Hostess" is a science fiction short story by American writer Isaac Asimov. It was first published in the May 1951 issue of Galaxy and reprinted in the 1969 collection Nightfall and Other Stories.-Plot summary:...

    features an alien race which requires small amounts of hydrogen cyanide in order for their hemoglobin analogues to remain stable. As such, while they do not suffer cyanide poisoning, cyanide withdrawal is, for them, an extremely painful condition similar to slow strangulation.
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