Last reviewed · How we verify

Levothyroxine-Na + iodide

Sanofi · FDA-approved active Small molecule

Levothyroxine-Na replaces deficient thyroid hormone to restore normal metabolic function, while iodide provides substrate for thyroid hormone synthesis.

Levothyroxine-Na replaces deficient thyroid hormone to restore normal metabolic function, while iodide provides substrate for thyroid hormone synthesis. Used for Hypothyroidism, Iodine deficiency with hypothyroidism.

At a glance

Generic nameLevothyroxine-Na + iodide
SponsorSanofi
Drug classThyroid hormone replacement therapy
TargetThyroid hormone receptors (TR-alpha and TR-beta)
ModalitySmall molecule
Therapeutic areaEndocrinology
PhaseFDA-approved

Mechanism of action

Levothyroxine sodium is a synthetic T4 (thyroxine) that is converted peripherally to the active T3 form, restoring thyroid hormone levels in hypothyroidism. The addition of iodide ensures adequate iodine availability for endogenous thyroid hormone production, addressing both hormone replacement and iodine deficiency simultaneously.

Approved indications

Common side effects

Key clinical trials

Primary sources

Every claim on this page is sourced from regulatory or scientific primary sources. See our editorial policy for full methodology.

SourceUsed for
ClinicalTrials.govTrial enrolment, design, endpoints, results

Competitive intelligence

For the full competitive landscape — auto-detected comparators, recent regulatory actions across the set, upcoming PDUFA, patent timeline, sponsor landscape: