Can I take Levothyroxine and Selenium together?

Why this happens

Selenium is a mineral that helps the body convert levothyroxine (T4) into its active form (T3). If you start taking selenium, your body might become more efficient at using the thyroid medication, which could potentially change the amount of medicine you need. Additionally, taking supplements at the exact same time as your medication can sometimes interfere with how well the pill is absorbed in your stomach.

You should leave a gap of at least 2 to 4 hours between taking your levothyroxine and any supplements containing selenium. If you decide to start taking selenium regularly, inform your doctor or pharmacist. They may want to monitor your thyroid levels (TSH) more closely to ensure your dose of levothyroxine remains correct for you.

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.