What does QID mean?
q.i.d., qid. An abbreviation meaning “four times a day.” The abbreviation is commonly used in drug dosing instructions. What does Qid on a prescription mean? In medical terms, 'qid' or 'q.i.d.' on a prescription, means four times a day (from the Latin 'quater in die'). What does QID and TID mean? qid (quater in die) means "four times a day" Sig (signa) means "write" tid (ter in die) means "three times a day"