Question

How many days should a combivent MDI 200 metered doses last if the patient has been instructed to take two puffs bid prn?

1) 25 days
2) 30 days
3) 45 days
4) 50 days

Answer 1

The Combivent MDI with 200 metered doses will last for 50 days if the patient adheres to the prescribed dose of two puffs taken twice a day, using a total of 4 puffs per day.

Step-by-step explanation:

The question asks how many days a Combivent MDI (Metered Dose Inhaler) with 200 metered doses will last if the patient is instructed to take two puffs bid (twice a day) as needed (PRN). To calculate the number of days the MDI will last, we need to consider the maximum number of puffs that would be used per day, which is 2 puffs taken twice daily for a total of 4 puffs per day. Since the inhaler has 200 metered doses, we divide the total number of doses by the maximum number of puffs per day.

To find the answer: 200 doses ÷ 4 puffs per day = 50 days. Therefore, if the patient uses the maximum number of doses daily, the inhaler will last for 50 days.