Question
A patient is prescribed metformin 500 mg, Sig: 1 tablet by mouth twice daily, dispense #180. How many days will this supply last?
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Answer
A.90 days
B.60 days
C.45 days
D.180 days
The patient takes 2 tablets per day (1 tablet BID = 2x/day). 180 tablets divided by 2 tablets/day = 90 days. 60 days would result from taking 3 tablets/day, 45 days from taking 4 tablets/day, and 180 days would only be correct if the patient took just 1 tablet daily, not BID.
