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Med Term
Timing & Frequency Based Abbreviations
| Term | Definition |
|---|---|
| BID | twice daily Latin: bis in die "two in a day" |
| TID | three times daily Latin: ter in die "three in a day" |
| Q | every x Q4hr = every 4 hours or Q3 days = every 3 days |
| QD | daily Latin: quaque die "each day" prohibited in many healthcare settings, easily confused with QID |
| QID | four times daily Latin: quater in die "four in a day" prohibited from many healthcare settings, easily confused with QD |
| QHS | at night Latin: quaque hora somni "each night at the hour of sleep" |
| AC | before meals Latin: ante cibum "before food" |
| PC | after meals Latin: post cibum "after food" |
| prn | as needed Latin: per re nata "as the need arises" |
| ad lib | as desired |