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Related Experiment Videos

Hypothyroidism resulting from generic levothyroxine failure.

B J Dong1, C H Brown

  • 1Thyroid Clinic, School of Pharmacy, University of California, San Francisco.

The Journal of the American Board of Family Practice
|May 1, 1991
PubMed
Summary
This summary is machine-generated.

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Generic levothyroxine may not be interchangeable with brand-name drugs, potentially causing severe hypothyroidism. Product substitution should be avoided until levothyroxine products are more uniform and FDA-approved as therapeutically equivalent.

Area of Science:

  • Endocrinology
  • Pharmacology
  • Pharmaceutical Science

Background:

  • Generic medications are encouraged for cost-effectiveness in healthcare.
  • Concerns exist regarding the interchangeability of generic levothyroxine with proprietary formulations.
  • Patient treatment often involves switching between different levothyroxine brands.

Observation:

  • A patient developed severe hypothyroidism after switching to a generic levothyroxine preparation.
  • The generic levothyroxine tablet contained approximately 30% less active ingredient than labeled.
  • This content was below the Food and Drug Administration's (FDA) established requirements.

Findings:

  • Levothyroxine content variability in generic formulations can compromise patient safety and efficacy.

Related Experiment Videos

  • Poor tablet bioavailability may contribute to reduced therapeutic effect.
  • Brand-name levothyroxine achieved euthyroidism at the same dosage, suggesting higher potency or bioavailability.

    • Implications:

    • Levothyroxine product substitution based solely on cost may pose risks to patient health.
    • There is a need for greater uniformity and confirmed therapeutic equivalence among levothyroxine products.
    • Healthcare providers should exercise caution when prescribing generic levothyroxine, considering potential interchangeability issues.