List of medical abbreviations: Latin abbreviations
Encyclopedia
| Abbrev. | Meaning | Latin (or New Latin) origin |
|---|---|---|
| a.c. | Before meals | |
| q.o.d | Every other day | |
| a.m. | Morning | ante meridiem |
| b.i.d. (or bid) | Twice a day/daily | bis in die |
| gtt. | Drop | gutta |
| h. | Hour | hora |
| h.s. | At bedtime | hora somni |
| qd | Daily | omni di |
| p.c. | After food | post cibum |
| p.m. | Afternoon | post meridiem |
| p.o. or po | Orally | per os |
| p.r.n. | as needed | pro re nata |
| q. | every | quaque |
| q.2.h. | Every two hours | quaque 2 hora |
| q.4.h. | Every four hours | quaque 4 hora |
| q.6.h. | Every six hours | quaque 6 hora |
| q.8.h. | Every eight hours | quaque 8 hora |
| q.d. or qd | Every day/daily | quaque die |
| q.i.d | Four times a day | quater die sumendus |
| q.h. | Every hour, hourly | quaque hora |
| q.s. | A sufficient quantity | quantum sufficiat |
Rx or  |
prescription | recipe |
| Sig. or S. | directions | signa |
| Stat. | Immediately, with no delay | statim |
| t.i.d. or tid | Three times a day | ter in die |
| u.d. | As directed | ut dictum |