• ac (ante cibum) means "before meals"

• bid (bis in die) means "twice a day"

• gt (gutta) means "drop"

• hs (hora somni) means "at bedtime"

• od (oculus dexter) means "right eye"

• os (oculus sinister) means "left eye"

• po (per os) means "by mouth"

• pc (post cibum) means "after meals"

• prn (pro re nata) means "as needed"

• q 3 h (quaque 3 hora) means "every 3 hours"

• qd (quaque die) means "every day"

• qid (quater in die) means "4 times a day"

• Sig (signa) means "write"

• tid (ter in die) means "3 times a day"