Pharmacology · single question
What is the mechanism of action of Levothyroxine?
Show answer and explanation
Correct answer: A. Thyroxine (T4) replacement
✓ A) T4 replacement is correct.
Levothyroxine (L-T4) is a synthetic form of thyroxine (T4) used to treat hypothyroidism. It works as direct hormone replacement — it is absorbed, circulates in blood, and is peripherally converted to T3 (the active form) by deiodinases. It suppresses TSH via negative feedback. It does not directly stimulate or block thyroid enzymes.
Levothyroxine (L-T4) is a synthetic form of thyroxine (T4) used to treat hypothyroidism. It works as direct hormone replacement — it is absorbed, circulates in blood, and is peripherally converted to T3 (the active form) by deiodinases. It suppresses TSH via negative feedback. It does not directly stimulate or block thyroid enzymes.