Carboprost is a synthetic prostaglandin

Prostaglandin

A prostaglandin is any member of a group of lipid compounds that are derived enzymatically from fatty acids and have important functions in the animal body. Every prostaglandin contains 20 carbon atoms, including a 5-carbon ring....

 analogue of PGF_2α (specifically, it is 15-methyl-PGF_2α) with oxytocic properties.

Carboprost induces contractions

Contraction (childbirth)

-Throughout menstrual cycle:The uterus frequently contracts throughout the entire menstrual cycle, and these contractions have been termed endometrial waves or contractile waves. These appear to involve only the sub-endometrial layer of the myometrium...

 and can trigger abortion in early pregnancy. It also reduces postpartum bleeding.

Indication

Used in postpartum hemorrhage caused by uterine atony not controlled by other methods.
Unlabeled use:

• Hemorrhagic Cystitis
• PID

Contraindication

Contraindicated in severe cardiovascular, renal, and hepatic disease, also contraindicated in Pelvic Inflammatory Disease. Exert caution in asthmatic patients.

Precautions

• asthma
• anemia
• jaundice
• diabetes mellitus
• seizure disorders
• past uterine surgery

Adverse Effects

• diarrhea (most common, may be sudden in onset)
• fever
• chills
• nausea/vomiting