a.c.
(ante cibos) before meals
b.i.d.
(bis in die) twice a day
gtt.
(guttae) drops
h.s.
(hora somni) at bedtime
o.d.
(oculus dexter) right eye
o.s.
(oculus sinister) left eye
p.c.
(post cibos) after meals
p.o.
(per os) orally
q.d.
(quaque die) everyday
q.s.
(quantum sufficiat) as much as needed
quot.
daily
Rx
(recipe) take
s.i.d.
(semel in die) once a day
stat.
(statim) immediately
t.i.d.
(ter in die) three times a day