Levothyroxine (Synthroid)

Endocrinology (Thyroid Hormone)

Dosing & Administration

Adult Dose

1.6 mcg/kg PO daily (usually 50-100 mcg). Take on empty stomach.

Pediatric Dose

Highly variable based on age (infants require up to 10-15 mcg/kg/day).

Renal Adjustment

No adjustment necessary.

Hepatic Adjustment

No adjustment necessary.

Safety & Special Populations

Pregnancy Category

A - Safe and required during pregnancy.

Lactation Safety

Compatible.

Contraindications & Adverse Effects

Contraindications

  • Uncorrected adrenal insufficiency
  • Acute MI

Common Adverse Effects

  • Hyperthyroidism symptoms (tachycardia, tremors, weight loss)