A patient is prescribed digoxin 0.25 mg daily. With 0.125 mg tablets, how many tablets are needed for one week?

A patient is prescribed digoxin 0.25 mg daily. With 0.125 mg tablets, how many tablets are needed for one week?

• A. 7 tablets
• B. 10 tablets
• C. 14 tablets
• D. 21 tablets

Answer: (C)

The calculation hinges on matching the dose per day with the strength of each tablet. The patient needs 0.25 mg each day, and each tablet provides 0.125 mg. Two of these tablets give 0.25 mg (0.125 mg × 2 = 0.25 mg), so the patient takes 2 tablets per day. Over a week (7 days), that’s 2 tablets/day × 7 days = 14 tablets. A quick check: total weekly dose would be 0.25 mg × 7 = 1.75 mg, and each tablet is 0.125 mg, so 1.75 mg / 0.125 mg per tablet = 14 tablets. Therefore, 14 tablets are needed to cover one week.

The calculation hinges on matching the dose per day with the strength of each tablet. The patient needs 0.25 mg each day, and each tablet provides 0.125 mg. Two of these tablets give 0.25 mg (0.125 mg × 2 = 0.25 mg), so the patient takes 2 tablets per day. Over a week (7 days), that’s 2 tablets/day × 7 days = 14 tablets. A quick check: total weekly dose would be 0.25 mg × 7 = 1.75 mg, and each tablet is 0.125 mg, so 1.75 mg / 0.125 mg per tablet = 14 tablets. Therefore, 14 tablets are needed to cover one week.