q.i.d.

q.i.d.: Seen on a prescription, q.i.d. (or qid) means 4 times a day (from the Latin quater in die). The abbreviation q.i.d. is also sometimes written without a period in capital letters as ôQIDö. 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: q.d. (qd or QD) is once a day; q.d. stands for ôquaque dieö (which means, in Latin, once a day). b.i.d. (or bid or BID) is two times a day; b.i.d. stands for ôbis in dieö (in Latin, 2 times a day). t.i.d. (or tid or TID) is three times a day ; t.i.d. stands for ôter in dieö (in Latin, 3 times a day). q_h: If a medicine is to be taken every so-many hours, it is written ôq_hö; the ôqö standing for ôquaqueö and the ôhö indicating the number of hours. So, for example, ô2 caps q4hö means ôTake 2 capsules every 4 hours.ö