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"
Now you're well on your way to your first prescription fraud!