A dog is prescribed metronidazole 250 mg tablets to take 1 tablet by mouth twice daily for 10 days. How many tablets are required to complete the course?

• A. 40 tablets
• B. 10 tablets
• C. 20 tablets
• D. 30 tablets

Answer: (C)

The main idea is to multiply the daily dose by the number of days. Since the dog takes 1 tablet twice daily, that’s 2 tablets per day. Over 10 days, you need 2 × 10 = 20 tablets. The tablet strength doesn’t change the count unless the dosing per administration changes. So, 20 tablets are required. The other options would fit if the daily dose or the duration were different (for example, 40 would come from 4 tablets per day or a 20-day course, 10 from 1 tablet per day, and 30 from 3 tablets per day or a 15-day course).