How many days will the following prescription last? Metformin 500 mg tablets #60 SIG: 1 gram po BID
10
15
30
60
15
Rationale: The prescription will last for 15 days. The order is for 500 mg BID. However, 1g is needed per dose, meaning that two 500 mg tablets are taken for each dose. So, 2 tablets x BID (two doses per day) means 4 tablets per day. To calculate how long the tablets will last, 60 divided by 4 = 15 days.
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