Product image of Letrox (Levothyroxine Sodium) supplied by GNH India

Letrox

Active Ingredient:
Levothyroxine Sodium
Origin:
EU

Letrox (Levothyroxine Sodium)

Levothyroxine Sodium, the active ingredient in Letrox, is a thyroid hormone presented as an oral tablet for oral use. It replaces deficient thyroid hormone in patients with hypothyroidism, supports hormone balance after thyroidectomy, and helps manage goiter.

GNH India supplies Letrox as a licensed, GDP‑compliant international pharmaceutical supplier, providing the product to hospitals, pharmacies, transplant centres and clinics worldwide under stringent quality assurance protocols. The medication is manufactured in the European Union following EU GMP standards, ensuring consistent potency and safety.

Manufacturer / TM Owner

Berlin-Chemie Ag

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Indications & Clinical Uses

Letrox, a synthetic thyroid hormone, is used to treat conditions resulting from deficient endogenous hormone production.

  • Hypothyroidism: restores normal thyroid hormone levels, alleviating fatigue, weight gain, and cold intolerance.
  • Thyroid hormone replacement after thyroidectomy: supplies the missing hormone to maintain metabolic stability.
  • Goiter: reduces gland enlargement by normalizing thyroid hormone feedback.
  • Subclinical hypothyroidism: normalizes TSH levels in patients with mild hormone deficiency.

How It Works

  • Levothyroxine Sodium provides exogenous thyroxine (T4) that is converted in peripheral tissues to the active hormone triiodothyronine (T3). The resulting T3 binds to nuclear thyroid hormone receptors, modulating gene transcription that regulates basal metabolic rate, protein synthesis, and growth. By restoring circulating hormone concentrations, the drug compensates for inadequate endogenous production.

Side Effects

Levothyroxine Sodium may cause a range of adverse reactions, from mild to serious. Patients should be aware of both common and rare side effects.

Common Side Effects

  • Headache: mild to moderate headache may occur, especially after dose changes.
  • Insomnia: difficulty sleeping can be reported, particularly with excess dosing.
  • Palpitations: awareness of rapid or irregular heartbeat.
  • Weight loss: unintended loss of weight due to increased metabolism.
  • Heat intolerance: feeling unusually warm or sweaty.
  • Tremor: fine shaking of hands or limbs.

Serious or Rare Side Effects

  • Cardiac arrhythmia: potentially life‑threatening irregular heart rhythms.
  • Angina or myocardial infarction: chest pain or heart attack in susceptible individuals.
  • Bone loss/osteoporosis: accelerated bone demineralization with long‑term overtreatment.
  • Allergic reaction: rash, itching, swelling, or anaphylaxis.
  • Adrenal crisis: precipitated in patients with adrenal insufficiency.
  • Severe hyperthyroidism symptoms: extreme anxiety, fever, or weight loss.

Precautions & Warnings

Levothyroxine therapy requires careful monitoring and individualized dosing to avoid complications.

  • Dose titration: adjust dose based on regular TSH and free T4 measurements.
  • Cardiovascular disease: monitor heart rate and rhythm, especially in patients with angina or arrhythmias.
  • Elderly patients: initiate therapy at lower doses to reduce risk of overtreatment.
  • Pregnancy and lactation: use only when benefits outweigh potential risks; monitor maternal thyroid status closely.
  • Drug interactions: review all concomitant medications for potential absorption or metabolic effects.
  • Store at ambient temperature: keep tablets in the original container, protect from moisture and light.

Avoid Interactions

Levothyroxine can interact with several medicines, altering its effectiveness or safety profile.

Major Interactions (Avoid)

  • Amiodarone: may increase thyroid hormone levels, risking hyperthyroidism.
  • Warfarin: levothyroxine can enhance anticoagulant effect, requiring INR monitoring.
  • Antacids containing aluminum or magnesium: reduce levothyroxine absorption if taken simultaneously.

Moderate Interactions (Monitor Closely)

  • Beta‑blockers: may mask symptoms of excess thyroid hormone.
  • Estrogen therapy: can increase levothyroxine requirement, necessitating dose adjustment.
  • Cholesterol‑lowering agents (e.g., cholestyramine): may decrease levothyroxine absorption, requiring monitoring of thyroid function.

Frequently Asked Questions

Letrox contains levothyroxine sodium, a synthetic thyroid hormone used to replace deficient hormone in patients with hypothyroidism, to provide hormone after thyroidectomy, and to help manage goiter by normalizing thyroid feedback mechanisms.

Levothyroxine sodium supplies exogenous T4, which is converted to the active hormone T3 in peripheral tissues. T3 binds to nuclear thyroid receptors, regulating gene expression that controls metabolism, growth, and protein synthesis, thereby compensating for insufficient endogenous hormone.

The appropriate dose of Letrox is individualized. A prescriber determines the exact amount based on the patient’s age, weight, severity of thyroid deficiency, and laboratory values such as TSH and free T4, and then adjusts it during follow‑up.

Levothyroxine is classified as a pregnancy‑category drug where benefits may outweigh risks. It is often continued during pregnancy to maintain maternal thyroid function, which is essential for fetal development. Breastfeeding mothers should use it under medical supervision, as small amounts pass into milk.

To order Letrox, submit an enquiry on the product page at gnhindia.com, specifying the required quantity. GNH India works with hospitals, pharmacies, and procurement teams worldwide, verifies trade or institutional credentials, and then provides pricing, availability, shipping details, and any necessary import documentation.

Letrox provides levothyroxine sodium, the same active ingredient found in most synthetic thyroid hormone preparations. Compared with combination T4/T3 products, Letrox offers a stable, single‑hormone formulation, which is preferred for most patients due to predictable pharmacokinetics and easier dose titration.

Letrox tablets should be stored at ambient temperature, below 25 °C. Keep them in the original container, protect from moisture, heat, and direct sunlight to maintain potency throughout the shelf life.

Letrox is taken orally, usually on an empty stomach 30‑60 minutes before breakfast. Swallow the tablet whole with a glass of water; do not crush or chew, and maintain consistent timing each day for optimal absorption.

Serious risks include cardiac arrhythmias, angina or myocardial infarction, severe hyperthyroid symptoms, bone loss with long‑term overtreatment, and rare allergic reactions. Patients should report chest pain, rapid heartbeat, severe tremor, or signs of an allergic response to their healthcare provider promptly.

Letrox is contraindicated in patients with untreated adrenal insufficiency, acute myocardial infarction, or uncorrected thyrotoxicosis. Individuals with known hypersensitivity to levothyroxine or any tablet excipients should also avoid using this medication.

Published by

GNH India Pharmaceuticals Limited

Licensed pharmaceutical supplier

Last updated:

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