QD is Latin for "quaque die" which means once a day. For example, if your prescription says PO QD it means you are suppose to take your medications by mouth once a day. There is another abbreviation that can be confused with QD, which is QID. QID is Latin and stands for "quater in die" which means four time a day. For example, if your prescription says PO QID it means you are suppose to take your medications by mouth four times a day.
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