Latin Abbreviations
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 di tid 3 times a day