Levotiroxina Abdi (Levothyroxine Sodium)

Levotiroxina Abdi is a synthetic thyroid hormone used to treat conditions caused by low endogenous thyroid production.

• Hypothyroidism: restores normal metabolic rate and alleviates symptoms such as fatigue and weight gain.
• Post‑thyroidectomy or radioactive iodine therapy: provides necessary hormone replacement after removal or destruction of thyroid tissue.
• Goiter: helps reduce gland size by normalising circulating thyroid hormone levels.

• Levothyroxine is a synthetic form of the endogenous hormone thyroxine (T4). After oral absorption, it is converted to the active hormone triiodothyronine (T3) in peripheral tissues. The hormone binds nuclear thyroid receptors, modulating gene transcription that regulates basal metabolic rate, protein synthesis, and growth. By restoring normal hormone concentrations, it compensates for the deficient thyroid output seen in hypothyroid states.

Levotiroxina Abdi may cause a range of adverse reactions, most of which are dose‑related.

Common Side Effects

• Headache: mild to moderate discomfort.
• Insomnia: difficulty falling or staying asleep.
• Palpitations: sensation of rapid or irregular heartbeat.
• Weight loss: unintended reduction in body weight.
• Heat intolerance: increased sensitivity to warm environments.
• Tremor: fine shaking of hands or limbs.

Serious or Rare Side Effects

• Cardiac arrhythmia: abnormal heart rhythm that may require medical attention.
• Angina pectoris: chest pain due to reduced coronary blood flow.
• Myocardial infarction: heart attack in susceptible individuals.
• Severe bone loss: accelerated osteoporosis with long‑term overtreatment.
• Allergic reaction: rash, itching, swelling, or anaphylaxis.
• Stevens‑Johnson syndrome: rare severe skin disorder.

Levotiroxina Abdi requires careful monitoring to avoid over‑ or under‑replacement.

• Dose adjustment in elderly: start with lower doses and titrate slowly.
• Monitor thyroid function tests: regularly check TSH and free T4 levels.
• Avoid use in untreated adrenal insufficiency: ensure adrenal status is corrected before therapy.
• Caution in cardiovascular disease: patients with angina or arrhythmias need close supervision.
• Use during pregnancy only if benefits outweigh risks: discuss with a healthcare professional.
• Store at room temperature: keep in the original container, protect from moisture and direct sunlight.

Levotiroxina Abdi can interact with several medicines and supplements, affecting its absorption or action.

Major Interactions (Avoid)

• Calcium supplements: reduce levothyroxine absorption when taken concurrently.
• Iron salts: markedly decrease oral bioavailability if administered together.
• Antacids containing aluminum or magnesium: impair absorption; separate dosing by at least 4 hours.

Moderate Interactions (Monitor Closely)

• Warfarin: levothyroxine may enhance anticoagulant effect; monitor INR.
• Oral contraceptives: may increase levothyroxine dose requirement; check thyroid function.