Can I take Levothyroxine and Zinc together?

Why this happens

Zinc is a metal ion that can bind to levothyroxine in the digestive tract, forming a complex that is too large to be absorbed by the body. This reduces the 'bioavailability' (the amount of active medicine available) of the thyroid hormone.

You should separate the time you take these two treatments by at least 4 hours. It is usually best to take your levothyroxine first thing in the morning on an empty stomach (30 to 60 minutes before breakfast) and wait until at least 4 hours later to take any supplements containing zinc.

Taking multiple medicines? Our Medicines Interaction Checker helps you check whether your prescriptions, over-the-counter medicines, and supplements are safe to take together. Simply search for your medicines to see potential interactions and what to do about them.

Disclaimer

This information is for general educational purposes only and should not be relied upon as a substitute for professional medical advice. Always consult your GP, pharmacist, or another qualified healthcare professional before making decisions about your medications. Individual circumstances may vary, and only a healthcare professional who knows your medical history can provide personalised guidance.