How many tablets of famotidine, each containing 20 mg, should a nurse administer for a dose of 40 mg?

To determine the correct number of tablets to administer, it is essential to understand the relationship between the total required dose and the dosage per tablet. Famotidine is available in 20 mg tablets, and the prescribed dose is 40 mg.

To find out how many tablets are needed, you divide the total required dose (40 mg) by the amount in each tablet (20 mg).

40 mg (total dose) ÷ 20 mg (per tablet) = 2 tablets

This calculation shows that administering two tablets delivers the exact required dose of 40 mg. Therefore, choosing two tablets ensures that the patient receives the correct and safe amount of medication.