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The medical abbreviation for once a week is qw. qw or qwk is used for every week. The medical abbreviation for once a week is qw. qw or qwk is used for every week.
Quote from SusanNC. Butch, as Jennifer mentioned PRN are the Latin initials for the medical term meaning As Needed. If the Dr. gives an order for X-med q4h PRN - it simply means that you can give X to the patient every 4 hours as needed. If this is a pain med and the patient doesn't complain of pain - you don't need to give it (because it's not needed). Hope this makes sense.