First MCT8 deficiency therapy approved - Summary - MDSpire
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First MCT8 deficiency therapy approved

  • By

  • Kathryn Wighton

  • September 29, 2026

  • 3 min

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Objective:

To announce the FDA approval of tiratricol for treating peripheral thyrotoxicosis in patients with MCT8 deficiency.

Approach:
  • FDA Approval: The FDA approved tiratricol (Emcitate) tablets for oral suspension for treating peripheral thyrotoxicosis in MCT8 deficiency.
  • Mechanism of Action: Tiratricol can enter cells independently of the MCT8 transporter, reducing elevated thyroid hormone levels in the blood.
  • Clinical Studies: Two clinical studies, including a randomized placebo-controlled trial and a long-term open-label study, demonstrated the efficacy of tiratricol.
Key Findings:
  • Tiratricol lowers circulating thyroid hormone levels.
  • Changes in heart rate and systolic blood pressure were observed.
  • Common adverse effects include diarrhea, vomiting, rash, and excessive sweating.
Limitations:
  • Patients on other thyroid medications should consult healthcare providers before starting tiratricol.
Conclusion:

Tiratricol received multiple designations for its treatment potential and was approved for use in patients with MCT8 deficiency.

Sources:

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