Common Prescription Abbreviations

Term -Abbreviation -Meaning


ante cibum- ac- before meals


bis in die- bid- twice a day


gutta- gt- drop


hora somni- hs- at bedtime


oculus dexter- od- right eye


oculus sinister- os- left eye


per os- po- by mouth


post cibum- pc- after meals


pro re nata- prn- as needed


quaque 3 hora- q3h- every 3 hours


quaque die- qd- every day


quater in die- qid- 4 times a day


ter in die- tid- 3 times a day


c- with


milligrams- mg


millilitres- ml