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Question:

A prescription is written for Symbicort 1 puff BID. The inhaler dispensed contains 120 puffs. What is the days' supply?

A 60
Explaination

The patient will use 2 puffs daily. The days' supply is calculated by creating a proportion with the information you have:
2 puffs/1 day= 120 puffs/ x days
Cross multiply and get:
2x = 120
x = 60