what is q.d. abbreviations in meds
(on prescription): Seen on a prescription, q.d. (or qd) means one a day (from the Latin quaque die). The abbreviation is sometimes written without a period in capital letters as QD. However it is written, it is one of a number of hallowed abbreviations of Latin terms that have been traditionally used in prescriptions to specify the frequency with which medicines should be taken. Other examples include: 1  b.i.d. 2  t.i.d. 3  q.i.d. 4  q_h: If a medicine is to be taken every so-many hours, it is written q_h; the q standing for quaque and the h indicating the number of hours.