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Does Levothyroxine And Liothyronine Interact with Oral Anticoagulants?

Levothyroxine And Liothyronine and Oral Anticoagulants have a major drug interaction according to U.S. FDA drug labeling data. Thyroid hormones increase catabolism of vitamin K-dependent clotting factors, impairing compensatory synthesis. Patients may require reduced anticoagulant dosage when starting thyroid replacement. The mechanism involves increased catabolism of vitamin k-dependent clotting factors. 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
Major
Levothyroxine And Liothyronine Class
l-Triiodothyronine
Management
Close medical supervision required
Data Source
U.S. FDA via OpenFDA

How This Interaction Works

The interaction between Levothyroxine And Liothyronine and Oral Anticoagulants occurs because increased catabolism of vitamin k-dependent clotting factors. Clinically, this means thyroid hormones increase catabolism of vitamin k-dependent clotting factors, impairing compensatory synthesis. patients may require reduced anticoagulant dosage when starting thyroid replacement. This is classified as a major interaction, meaning it could cause serious harm if not properly managed. Your healthcare provider may need to adjust dosages, substitute one medication, or increase monitoring frequency.

What To Tell Your Doctor or Pharmacist

If you are taking Levothyroxine And Liothyronine and your doctor is considering prescribing Oral Anticoagulants (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 how frequently you should be monitored while these are co-prescribed
  • Ask whether any dosage adjustments are needed
  • Never stop or change either medication without first consulting your healthcare provider
💊 Levothyroxine And Liothyronine(Evexithroid)+💊 Oral Anticoagulants

Severity & Interaction Details

⚠️
major
Use with caution — major interaction
Serious risk of clinically significant harm. Generally avoid; if used, monitor closely.
Severity scale
MinorContra
On record
Yes
Drug A class
l-Triiodothyronine
Drug B class
—
Source
NLP:levothyroxine, liothyronine

What this means in plain English

Thyroid hormones increase catabolism of vitamin K-dependent clotting factors, impairing compensatory synthesis. Patients may require reduced anticoagulant dosage when starting thyroid replacement.

What the FDA label says

"Increased catabolism of vitamin K-dependent clotting factors"

📖 Source: NLP:levothyroxine, liothyronine

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Data sourced from U.S. FDA drug labeling via openFDA and the NIH National Library of Medicine. For informational purposes only. Always consult your pharmacist or physician.