NAPLEX (North American Pharmacist Licensure Examination) Practice Exam

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What is the active ingredient in the dandruff treatment, Nizoral A-D?

Pyrithione Zinc
Selenium Sulfide
Ketoconazole
Coal Tar

The correct answer is: Ketoconazole

Nizoral A-D is a popular dandruff treatment that works by targeting a specific type of fungus known as Malassezia. This fungus is responsible for causing dandruff in many people. While all of the other options listed have been used in dandruff treatments, they do not specifically target this fungus. Pyrithione Zinc and Selenium Sulfide work by slowing down the production of skin cells, which can lessen the appearance of dandruff. Coal Tar works by reducing inflammation and slowing down the production of skin cells. However, neither of these ingredients directly target the Malassezia fungus. Ketoconazole, on the other hand, specifically targets and kills this fungus, making it the active ingredient in Nizoral A-D and the most effective option for treating dandruff caused by this fungus.