Comprehensive and Detailed Step-by-Step Explanation:
Levothyroxine (Synthroid)is athyroid hormone replacementused to treathypothyroidism. It must be taken on an empty stomachbecause food, calcium, and ironinterfere with its absorption.
Administration Guidelines for Levothyroxine:
* Take30-60 minutes before breakfastwith afull glass of water.
* Avoidcalcium, iron, and antacidsfor4 hoursafter taking it.
#Explanation of Answer Choices:#A. Levothyroxine#Correct.Absorption is reduced by food, calcium, and iron.#B. Amlodipine# Incorrect.A calcium channel blocker that can be taken with or without food.#C.
Cyclobenzaprine# Incorrect.A muscle relaxant with no food restrictions.#D. Loratadine# Incorrect.An antihistamine that does not require fasting.
#Reference:
* American Thyroid Association (ATA) Levothyroxine Guidelines
* FDA Drug Labeling for Synthroid