Does Sevelamer Carbonate Interact with Levothyroxine?
Sevelamer Carbonate and Levothyroxine have a moderate drug interaction according to U.S. FDA drug labeling data. Sevelamer carbonate may reduce bioavailability of levothyroxine, which could have clinically significant effect on safety or efficacy. Consider separation of administration timing. The mechanism involves reduction in bioavailability. Patients taking both medications should consult their healthcare provider before starting, stopping, or changing the dosage of either drug. This information is based on official FDA drug labeling sourced from OpenFDA and the NIH National Library of Medicine.
- Severity
- Moderate
- Management
- Monitor for effects
- Data Source
- U.S. FDA via OpenFDA
How This Interaction Works
The interaction between Sevelamer Carbonate and Levothyroxine occurs because reduction in bioavailability. Clinically, this means sevelamer carbonate may reduce bioavailability of levothyroxine, which could have clinically significant effect on safety or efficacy. consider separation of administration timing. This is classified as a moderate interaction. While it may not require stopping either medication, your healthcare provider should be aware you are taking both so they can monitor for potential effects and adjust treatment if necessary.
What To Tell Your Doctor or Pharmacist
If you are taking Sevelamer Carbonate and your doctor is considering prescribing Levothyroxine (or vice versa), make sure to:
- Inform your doctor and pharmacist of all current medications, including over-the-counter drugs and supplements
- Ask whether the benefits of combining these medications outweigh the risks for your specific situation
- Ask what symptoms to watch for that would indicate the interaction is causing problems
- Ask whether any dosage adjustments are needed
- Never stop or change either medication without first consulting your healthcare provider