For those of you who wonder what the meaning of some of the directions may be on your prescription I thought I would help. This is not comprehensive but I hope it is illuminating for some of those obscure acronyms of Latin origin.

p.o. - per os - taken by mouth

i.p. - intraperitoneal - injected into the peritoneal cavity

i.v. - intravenous - injected in a vein.

s.c. -sub-cutaneously - injected under/into the skin

i.m. - intramuscular

q.i.d. - quad in diem - four times a day

q.d. - quad diem - everyday

b.i.d. - bis in die - twice a day

t.i.d. - ter un die - three times a day