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Medicine details

Conditions: Hypothyroidism
Alternative names: Eltroxin; Levothyrox
Therapeutic class: Thyroid Hormone
Pharmacological class: Synthetic Thyroxine
Contraindications: untreated thyrotoxicosis; adrenal insufficiency
Precautions and warnings: monitor thyroid function tests regularly; may interact with diabetes medications
Minor side effects: palpitations; weight loss; tremor
Moderate side effects: tachycardia; anxiety; insomnia
Dosage forms: Tablet
Administration route: Oral use
Patient summary: Formulated to support thyroid function, intended to manage hypothyroidism.
Prescription status: POM
Manufacturer: AbbVie
Onset Time: 2–4 weeks
Duration: 24 hours
Storage instructions: Store at room temperature away from moisture.
Drug interactions: calcium carbonate; iron supplements; antacids
Age restrictions: Safe for all ages when dosed correctly.
Pregnancy and breastfeeding: Pregnancy: Essential during pregnancy. Breastfeeding: Generally considered safe.

Serious side effects

myocardial infarction — requires immediate medical attention; arrhythmia — requires immediate medical attention

Mechanism of action

Levothyroxine is a synthetic form of the thyroid hormone thyroxine (T4). It mimics endogenous T4, which is converted to triiodothyronine (T3) intracellularly, helping to restore normal metabolic levels in patients with deficient production.

Levothroid

Formulated to support thyroid function, intended to manage hypothyroidism.

Editorial Notes

Active ingredient(s): Levothyroxine
Listed indication(s): Hypothyroidism