411 REFERENCE · Wikibooks
What You Should Know About Medicines/Glossary of Pharmacological Abbreviations
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Abbreviation Meaning PRN As needed B.I.D Twice per day, normally in the morning and at nightMLMililitergGramRxPrescriptionT.I.DThree times a day, normally with breakfast, lunch, and dinnerµgMicrogramAMIn the morning AC Before meals MDD Maximum daily dose NPO Nothing by mouth /OTC/ Over the counter PO By mouth