medical math


a.c.


ante cibumbefore meals


p.c.


post cibumafter meals


p.r.n.


pro re nataas needed


gtt


guttadrop


ad.lib.


ad libitumAs desired, freely


b.i.d.


bis in dietwice a day


t.i.d.


ter in diethree times daily


q.i.d.


quater in diefour times a day


p.o.


per osby mouth


c


cumwith


a


antebefore


p


postafter


s


sanswithout


q


quaqueevery


NPO


nil per osnothing by mouth