NAPLEX (North American Pharmacist Licensure Examination) Practice Exam

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Which is NOT a common diluent or filler found in tablets/capsules?

  1. Lactose

  2. Starches

  3. Magnesium stearate

  4. Calcium salts

The correct answer is: Magnesium stearate

Common diluents and fillers found in tablets/capsules include lactose, starches, and calcium salts. Magnesium stearate, on the other hand, is not a diluent or filler but is commonly used as a lubricant in the manufacturing process to prevent ingredients from sticking to the equipment during production. Therefore, the correct answer is C, Magnesium stearate, as it is not a common diluent or filler but a lubricant.