## To calculate how many inhalers should be dispensed to a patient for a 60-day supply, follow these steps:

1. Determine the number of inhalations needed per day: Since the dose is 200 mcg twice a day, which requires 4 inhalations each time, we multiply this by 2 to get a total of 8 inhalations per day.

2. Calculate the number of days one inhaler would last: Given that the commercial inhaler contains 200 inhalations, divide 200 by 8 (the number of inhalations per day) to find out how many days one inhaler would last. In this case, one inhaler would last for 25 days (200/8 = 25).

3. Calculate the number of inhalers needed for 60 days: Divide 60 (the number of days in the prescription) by the number of days one inhaler would last (25). This will give you the number of inhalers required to cover the 60-day supply. In this case, 60 divided by 25 is approximately 2.4 inhalers.

4. Round up to the nearest whole number: Since inhalers are not supplied in fractions, you should round up to the nearest whole number to ensure you have enough inhalers to cover the full 60-day period. Therefore, two inhalers should be dispensed to the patient for a 60-day supply.

It's important to note that this is a simplified calculation and does not account for potential missed doses or variations in usage. It's always recommended to consult a healthcare professional or pharmacist for accurate dosing instructions and medication supply.