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Headache and Migraine Glossary

Abbreviations commonly used in writing prescriptions:


a.c.   before meals (Latin: ante cibum)
b.i.d.   twice daily (Latin: bis in die)
b.i.n.   twice nightly (Latin: bis in noctus )
c   with (Latin: cum)
cap   capsule (Latin: capsula)
d day (Latin: dies)
daw Dispense as written, no substitutions
gtt   drop (Latin: gutta)
h.s.   bedtime (Latin: hora somni)
noxt   at night
O.D.   Right eye (Latin: oculus dexter)
O.S.   Left eye (Latin: oculus sinister)
O.U.   Each eye (Latin: oculus uterque)
p.c.   After meals (Latin: post cibum)
pil Pill (Latin: pilula)
p.o. By mouth (Latin: per os)
p.r.n.   As needed (Latin: pro re nata)
q.d.   Every day (Latin: quaque die)
q.h.   Every hour (Latin: quaque hora)
q.2h.   Every two hours (Latin: quaque secunda hora)
q.3h.   Every three hours (Latin: quaque tertia hora)
q.4h.   Every four hours (Latin: quaque quarta hora)
q.q.h.   Every four hours (Latin: quaque quarta hora)
q.6h.   Every six hours (Latin: quaque sex hora)
q.8h.   Every eight hours (Latin: quaque octa hora)
q.i.d.   Four times per day (Latin: quater in die)
q.s.   As much as is required (Latin: quantum sufficit)
s.   Without (Latin: sine)
s.o.s.   If necessary (Latin: semis)
ss   Half (Latin: sine)
t.d.s   To be taken three times daily (Latin: ter die sumendum)
t.i.d.   Three times a day (Latin: ter in die)
t.i.n.   Three times a night (Latin: ter in nocte)
ut. dict. As directed (Latin: ut dictum)
            

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