The nurse is teaching a patient how to calculate how long the metered-dose inhaler (MDI) canister can be used. If the canister contains 200 puffs and the patient administers 2 puffs 3 times each day, how long will the canister last?
a. 33 days
b. 34 days
c. 66 days
d. 100 days
A
Two puffs x 3 times daily = 6 puffs per day; 200 puffs/6 puffs per day = 33.3 days; therefore, the canister will last 33 days with correct medication administration. If the canister lasted 34 days, there would not be enough for the final entire day. Sixty-six days and 100 days are incorrect cal-culations of the problem.
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