Can I take Levothyroxine and Omeprazole together?
Drug interaction guide
Originally published 25 Jan 2026
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Taking omeprazole may make your levothyroxine less effective. This could lead to symptoms of an underactive thyroid, such as feeling tired, cold, or gaining weight, even though you are taking your medication.
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Why this happens
Levothyroxine needs a highly acidic environment in the stomach to be absorbed properly into your body. Omeprazole works by reducing stomach acid, which can prevent the levothyroxine from dissolving and entering your bloodstream effectively.
What you should do
You should ideally take levothyroxine on an empty stomach, at least 30 to 60 minutes before breakfast or taking other medications like omeprazole. If you are starting, stopping, or changing your dose of omeprazole, tell your doctor. They may need to perform a blood test (TSH test) to check if your levothyroxine dose needs adjusting.
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Using other medicines
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.
Clause de non-responsabilité
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.
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Historique de l'article
Les informations contenues dans cette page sont rédigées et évaluées par des cliniciens qualifiés.
25 janvier 2026 | Publié à l'origine

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