Does Furosemide Interact With Levothyroxine?
Other drugs: Carbamazepine Furosemide (> 80 mg IV) Heparin Hydantoins Non-Steroidal Anti-inflammatory Drugs - Fenamates These drugs may cause protein-binding site displacement.
Severity: Minor
Severity basis: drug interactions section. Combining Furosemide (Loop diuretic) and Levothyroxine (Thyroid hormone) is classified as a minor interaction.
What to Do
This is generally a minor interaction, but review it with your pharmacist to be sure it is safe for you.
From the FDA Label
Other drugs: Carbamazepine Furosemide (> 80 mg IV) Heparin Hydantoins Non-Steroidal Anti-inflammatory Drugs - Fenamates These drugs may cause protein-binding site displacement.
Source: FDA structured product labeling (set_id 008de8fd-150f-4022-8ccb-c8bfa94875c7).
Check these against your full medication list in our free Interaction Checker
This information is educational — not medical advice.
This page is provided for general educational purposes and summarizes publicly available data from sources such as the U.S. Food & Drug Administration. It is not a substitute for the judgment of a licensed clinician and should not be used to start, stop, or change any medication. It may be incomplete or out of date, and individual circumstances vary. Always talk with your prescriber or pharmacist about your specific medications and health conditions. If you think you may have a medical emergency, call 911.
Other Furosemide Interactions
- Furosemide + Cyclosporine(moderate)
- Furosemide + Indomethacin(moderate)
- Furosemide + Methotrexate(moderate)
- Furosemide + Phenytoin(moderate)
- Furosemide + Sucralfate(moderate)
- Furosemide + Aspirin(minor)
- Furosemide + Atenolol(minor)
- Furosemide + Celecoxib(minor)
- Furosemide + Liothyronine(minor)
- Furosemide + Lithium(minor)
- Furosemide + Meloxicam(minor)
- Furosemide + Naproxen(minor)
- Furosemide + Potassium Chloride(minor)
- Furosemide + Ramipril(minor)
- Furosemide + Risperidone(minor)
- Furosemide + Tamsulosin(minor)
Other Levothyroxine Interactions
- Levothyroxine + Amitriptyline(moderate)
- Levothyroxine + Carbamazepine(moderate)
- Levothyroxine + Dexamethasone(moderate)
- Levothyroxine + Alendronate(minor)
- Levothyroxine + Amiodarone(minor)
- Levothyroxine + Aspirin(minor)
- Levothyroxine + Ferrous Sulfate(minor)
- Levothyroxine + Liothyronine(minor)
- Levothyroxine + Nifedipine(minor)
- Levothyroxine + Phenytoin(minor)
- Levothyroxine + Propranolol(minor)
- Levothyroxine + Rifampin(minor)
- Levothyroxine + Semaglutide(minor)
- Levothyroxine + Sertraline(minor)
- Levothyroxine + Sucralfate(minor)