In prescriptions, "q.i.d." or "qid" indicates that a medication should be taken four times daily. This abbreviation, derived from Latin, can also appear as "QID" without periods. It is part of a set of traditional Latin-based abbreviations used to denote how frequently medicines should be administered.Other examples include:- "q.d." (or qd/QD), meaning once a day, which comes from the Latin phrase meaning "once a day."- "b.i.d." (or bid/BID), indicating twice daily, is derived from Latin meaning "twice a day."- "t.i.d." (or tid/TID), signifying three times a day, originates from the Latin phrase for "three times a day."For medications prescribed at specific hourly intervals, the notation "q_h" is used, with "q" standing for "every" and "h" denoting the number of hours. For instance, "2 caps q4h" translates to "Take 2 capsules every 4 hours."
