Difficulty: Medium
Average Score: 76%
Simulated
A nurse is taking a medication history from a client who has a new prescription for levothyroxine. The nurse should instruct the client to wait 4 hr after taking levothyroxine before taking which of the following supplements?
Correct answer
D
Rationale
The correct answer is D: Calcium. Levothyroxine is a thyroid hormone replacement medication that can bind to calcium, iron, and certain other minerals, reducing its absorption. Instructing the client to wait 4 hours after taking levothyroxine before taking calcium ensures optimal absorption of the medication. Zinc, Vitamin C, and Ginkgo biloba do not interfere significantly with levothyroxine absorption, so there is no need to wait specifically before taking them.