Latin Prescription 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 (q 3 h)
Every 3 hours
quaque die (qd)
Every day
ter in die (tid)
3 times a day
quater in die (qid)
4 times a day