List of medical abbreviations: Latin abbreviations

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The main discussion of these abbreviations in the context of drug prescriptions and other medical prescriptions is at List of abbreviations used in medical prescriptions. Some of these abbreviations are best not used, as marked and explained there.

Abbrev.MeaningLatin (or New Latin) origin
a.c.Before mealsante cibum
q.o.dEvery other dayquaque otra die
a.m.Morningante meridiem
b.i.d. or bid or bdTwice a day/dailybis in die
gtt.Drop(s)gutta(e)
h.Hourhora
h.s.At bedtimehora somni
N.P.ONothing By Mouthnil per os
o.d. or odonce a day
right eye
omne in die
oculus dexter
o.s. or osleft eyeoculus sinister
o.u.Both eyesoculus uterque
p.c.After foodpost cibum
p.m.Afternoonpost meridiem
p.o. or poOrallyper os
p.r. or prRectallyper rectum
p.r.n.as neededpro re nata
q.everyquaque
q.2.h.Every two hoursquaque secunda hora
q.4.h.Every four hoursquaque quarta hora
q.6.h.Every six hoursquaque sexta hora
q.8.h.Every eight hoursquaque octava hora
q.a.m. or qamEvery morningquaque ante meridien
q.d. or qdEvery day/dailyquaque die
q.i.d or qdsFour times a dayquater in die
q.h.Every hour, hourlyquaque hora
q.s.A sufficient quantityquantum sufficiat
Rx or Medical Recipe Symbol mod.JPG prescriptionrecipe
Sig. or S.directionssigna
Stat.Immediately, with no delaystatim
t.i.d. or tid or tdsThree times a dayter in die
u.d.As directedut dictum