Comparative Pharmacology
Head-to-head clinical analysis: LEVOTHYROXINE versus TRIOSTAT.
Peer-Reviewed Evidence
Head-to-head clinical analysis: LEVOTHYROXINE versus TRIOSTAT.
Levothyroxine vs TRIOSTAT
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Levothyroxine is a synthetic form of thyroxine (T4) that is converted to triiodothyronine (T3) in peripheral tissues. T3 binds to thyroid hormone receptors in the nucleus, regulating gene transcription and increasing metabolic rate, protein synthesis, and oxygen consumption.
TRIOSTAT (liothyronine sodium) is a synthetic form of the thyroid hormone triiodothyronine (T3). It binds to thyroid hormone receptors in the nucleus, altering gene expression and increasing cellular metabolism, oxygen consumption, and heat production.
1.6 mcg/kg orally once daily, adjusted based on TSH levels; typical adult dose 50-200 mcg/day.
Adult: 5 mcg/kg IV every 8 hours. Adjust based on clinical response.
None Documented
None Documented
Clinical Note
moderateLevothyroxine + Sulfisoxazole
"The metabolism of Sulfisoxazole can be decreased when combined with Levothyroxine."
Clinical Note
moderateLevothyroxine + Erythromycin
"The metabolism of Erythromycin can be decreased when combined with Levothyroxine."
Clinical Note
moderateLevothyroxine + Cyclosporine
"The metabolism of Cyclosporine can be decreased when combined with Levothyroxine."
Clinical Note
moderateLevothyroxine + Fluconazole
7 days (euthyroid); prolonged in hyperthyroidism (3-4 days) and shortened in hypothyroidism (9-10 days); clinical effects persist for weeks after discontinuation due to slow elimination.
2.5 days (terminal); shortened in hyperthyroidism, prolonged in hypothyroidism
Primarily renal (approximately 50% as unchanged drug and metabolites, mainly glucuronide and sulfate conjugates); minor biliary/fecal excretion (<20%).
Renal (40% unchanged, 20% as liothyronine conjugates); fecal (35%)
Category A/B
Category C
Thyroid Hormone
Thyroid Hormone
"The metabolism of Fluconazole can be decreased when combined with Levothyroxine."