NAPLEX (North American Pharmacist Licensure Examination) Practice Exam

5 mL of lithium citrate syrup is equivalent to how many mg of lithium carbonate?

1. 100 mg

2. 200 mg

3. 300 mg

4. 400 mg

The correct answer is: 300 mg

Lithium citrate syrup is a liquid medication and lithium carbonate is a solid medication. Therefore, it can be tricky to convert between the two. However, we can use the density of the liquid to help us determine the equivalent amount in the solid form. Since 5 mL is equivalent to 1 teaspoon, we need to know how much lithium carbonate is present in 1 teaspoon of lithium citrate syrup. This information is not provided, so we cannot accurately determine the equivalent amount. Option A is incorrect because it assumes a 11 ratio, which may not be the case. The same reasoning applies to options B and D. Therefore, option C is the best choice as it is the only option that does not make assumptions based on incomplete information.