Practice Quiz

PTCE Pharmacy Technician

Category - Process & Dispense

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A new batch of lidocaine 5% cream needs to be mixed, to replenish the pharmacy's stock. The pharmacy needs 1,000 g to be mixed. How much 100% lidocaine should you use to mix the solution?
  1. 50 grams
  2. 500 grams
  3. 1500 grams
  4. 150 grams
Explanation
Answer: A - The stock 100% lidocaine would be mixed with an unmedicated base cream used for compounding pharmaceutical products. You should use 50 grams of 100% lidocaine to mix this product for the pharmacy's stock. The desired 5% lidocaine cream would contain 5 grams of 100% lidocaine for every 100 grams of final product. So, if 1,000 grams of final product is desired, you would need 5 grams x 10 = 50 grams 100% lidocaine. This would result in a 5% lidocaine cream.
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