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QID: Four times a day. QHS: Before bedtime or every hour of sleep. Q4H: Every 4 hours. What is QID and BID? q.i.d. (on prescription): Seen on a prescription, q.i.d. (or qid) means 4 times a day (from the Latin quater in die). b.i.d. (or bid or BID) is twoRead More →