a.c. = before meals ad lib: use as much as one desires b.i.d. = twice a day caps = capsules da or daw = dispense as written g (or gm or GM) = gram gtt. = drops h. = hour mg = milligram ml = milliliter p.c. = after meals p.o. = by mouth, orally p.r.n. = when necessary q.d. = once a day q.i.d. = four times a day q.h. = every hour q.2h. = every 2 hours q.4h. = every 4 hours t.i.d. = three times a day
mm = millimetre, m = metre, g = grams, cm = centimetre, ML = megalitre (1,000,000 litres), ML/d = megalitres per day, cm/sec = centimetres per second, EC = electrical conductivity, = more than, = less than, 4WD = four wheel drive vehicle, TDS = total dissolved solids.