Ontario Registered Pharmacy Technician (RphT) Practice Exam

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How much neomycin powder must be added to 60g of fluocinolone cream to dispense 0.5% neomycin?

  1. 120mg

  2. 240mg

  3. 300mg

  4. 600mg

The correct answer is: 300mg

The amount of neomycin powder needed can be calculated by using the formula (Desired strength/Stock strength) x Amount of cream. Since the desired strength is 0.5% and the stock strength is 1%, we can plug in these values to get: (0.5/1) x 60g = 0.5 x 60g = 30g of neomycin cream. However, since neomycin comes in powder form, we must convert grams to milligrams. This means we need 30,000mg of neomycin powder. Therefore, the correct answer is 300mg. The other options are incorrect because they do not follow the formula. Option A, 120mg, is only 1/4 of the neomycin needed. Option B, 240mg, is only 1/

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