What You Should Know About Medicines/Glossary of Pharmacological Abbreviations

Abbreviation Meaning
PRN As needed
B.I.D Twice per day, normally in the morning and at night
ML Mililiter
g Gram
Rx Prescription
T.I.D Three times a day, normally with breakfast, lunch, and dinner
µg Microgram
AM In the morning
AC Before meals
MDD Maximum daily dose
NPO Nothing by mouth
OTC Over the counter
PO By mouth