Can you take Tums with levothyroxine?
Usually, no—at least not at the same time. Tums contains calcium, and calcium can bind levothyroxine in the gut and reduce how much of the hormone your body absorbs. That can make your thyroid levels drift out of range if the timing is too close.
How long should you separate Tums (calcium) from levothyroxine?
Take levothyroxine and calcium-containing products (including Tums) at least 4 hours apart. This spacing helps prevent the minerals from interfering with levothyroxine absorption.
What if you already took them together?
If you took them close together, the safest move is to resume the usual schedule next time and keep future doses separated by at least 4 hours. If you often forget timing, tell your clinician or pharmacist and ask whether you need a thyroid blood test sooner than planned.
Are there other common medicines/foods that can block levothyroxine?
Yes. Similar timing issues can happen with:
- Other calcium or iron supplements
- Antacids that contain minerals
- Some products that bind in the gut (your pharmacist can help check specific brands)
When possible, keep levothyroxine separated from these by at least 4 hours.
When should you check your thyroid labs?
If you change how you take levothyroxine (for example, starting calcium/antacids or changing timing), clinicians often recheck TSH (and sometimes free T4) after several weeks to confirm the dose still fits your needs.
Quick practical approach
Take levothyroxine, then wait at least 4 hours before taking Tums.
Sources
No provided sources.