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Thyroid Medication Absorption

Meaning

The biopharmaceutical process by which orally administered synthetic thyroid hormones, primarily levothyroxine (T4) or liothyronine (T3), are transferred from the gastrointestinal tract into the systemic circulation. This process is critical for achieving therapeutic hormone levels and is highly sensitive to factors such as stomach acidity, co-ingested foods, and other medications. Variable absorption is a major cause of therapeutic instability in thyroid patients.