Ontario Registered Pharmacy Technician (RphT) Practice Exam

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The pharmacy receives an order for 10% ungt but only has 15% and 5% strength in stock. In order to compound this prescription what ratio would the 2 stock ointments need to be mixed?

  1. 1:1

  2. 1:2

  3. 2:1

  4. 1:3

The correct answer is: 1:1

The ratio of the 2 stock ointments would need to be 11. This means that equal amounts of the 15% and 5% strength ointments would be mixed together to achieve a final strength of 10%. Option B, 1:2, would result in a final strength of 7.5%, which is too low. Option C, 2:1, would result in a final strength of 10%, but in the opposite direction (more of the 5% strength ointment than the 15%). Option D, 1:3, would result in a final strength of 6.7%, which is also too low. Therefore, the only correct option is A, 1:1.

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