Question

diphenhydramine is the active ingredient in many common over - the - counter antihistamine medications. the packaging indicates that the typical adult dosage is 50 mg of diphenhydramine every 6 hours. each tablet contains 25 mg of drug. how many tablets will be taken over the course of 4 days.
options:
32 tablets
24 tablets
16 tablets
8 tablets
4 tablets

Explanation:

Step1: Find tablets per day

The dosage is 50 mg every 6 hours. First, find how many times a day (24 hours) the dosage is taken: $24\div6 = 4$ times. Each tablet is 25 mg, so per dose, number of tablets: $50\div25 = 2$ tablets. So per day: $4\times2 = 8$ tablets.

Step2: Find total tablets for 4 days

Multiply daily tablets by 4: $8\times4 = 32$? Wait, no, wait. Wait, 50 mg per dose, 25 mg per tablet, so per dose: 50/25 = 2 tablets. Every 6 hours, so in 24 hours: 24/6 = 4 doses. So daily tablets: 42 = 8. For 4 days: 84 = 32? Wait, but let's check again. Wait, 50 mg per dose, 25 mg per tablet, so 2 tablets per dose. Every 6 hours, so 4 times a day. 42 = 8 per day. 84 = 32. Wait, but the options have 32? Wait, no, maybe I made a mistake. Wait, 50 mg per dose, 25 mg per tablet: 50/25 = 2 tablets per dose. Every 6 hours: 24/6 = 4 doses. So 42 = 8 per day. 4 days: 84 = 32. So the answer should be 32 tablets? Wait, but let's re - calculate.

Wait, 50 mg per dose, 25 mg per tablet: so 2 tablets per dose. Every 6 hours: in 24 hours, 24/6 = 4 doses. So 42 = 8 tablets per day. For 4 days: 84 = 32 tablets. So the correct answer is 32 tablets.

Answer:

32 tablets (corresponding to the option "32 tablets")