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MedicalTermsp.o.: Abbreviation meaning by mouth, orally (from the Latin "per os", by mouth). One of a number of hallowed abbreviations of Latin terms that have traditionally been used in prescriptions. Some others: * a.c. = before meals (from "ante cibum", before meals)
* b.i.d. = twice a day (from "bis in die", twice a day)
* t.i.d. = three times a day
* gtt. = drops (from "guttae", drops)
* p.c. = after meals (from "post cibum", after meals)
* p.r.n. = when necessary (from "pro re nata", for an occasion that has arisen, as circumstances require, as needed)
* q.d. = once a day (from "quaque die", once a day)
* q.i.d. = four times a day (from "quater in die", 4 times a day)
* q.o.d. = every other day
* q.o. = every day
* q.d. = daily
* q._h. = If a medicine is to be taken every so-many hours (from "quaque", every and the "h" indicating the number of hours)
* q.h.s. = every night at bedtime
* q.h. = every hour
* q.2h. = every 2 hours
* q.3h. = every 3 hours
* q.4h. = every 4 hours
* t.i.d. = three times a day (from "ter in die", 3 times a day)
* ut dict. = as directed (from "ut dictum", as directed)
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