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Question:

A prescription is written for Cipro 500 mg 1 tab PO BID for 10 days. How many tablets should be dispensed?

A 20
Explaination

BID means 2 times per day.
Create a proportion with the information you have:
2 tablets/ 1 day = x tablets/ 10 days
Cross-multiply to solve this equation and you'll have the answer:
x = 20 tablets