Product image of L-Thyrox (Levothyroxine Sodium, Potassium Iodide) supplied by GNH India

L-Thyrox

Active Ingredient:
Levothyroxine Sodium, Potassium Iodide
Origin:
EU

L-Thyrox (Levothyroxine Sodium, Potassium Iodide)

Levothyroxine Sodium, the active ingredient in L-Thyrox, is a thyroid hormone replacement presented as an oral formulation for oral use. It restores normal thyroid hormone levels in patients with hypothyroidism, post‑thyroidectomy hormone deficiency, congenital thyroid disorders, and goiter.

GNH India supplies L-Thyrox as a licensed, GDP‑compliant international pharmaceutical supplier serving hospitals, pharmacies, and clinics worldwide, providing reliable sourcing and regulatory‑approved distribution for thyroid hormone therapies. The product meets EU quality standards and is packaged to ensure stability during transport and storage.

Manufacturer / TM Owner

Hexal Ag

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Indications & Clinical Uses

Levothyroxine is a synthetic thyroid hormone used to restore normal thyroid function in conditions characterized by hormone deficiency.

  • Hypothyroidism: normalizes thyroid hormone levels, relieving fatigue, weight gain, and cold intolerance.
  • Post‑thyroidectomy hormone replacement: provides necessary thyroid hormone after surgical removal of the thyroid gland.
  • Congenital hypothyroidism: supplies essential hormone to infants born with thyroid deficiency, supporting growth and development.
  • Goiter management: reduces thyroid‑stimulating hormone (TSH) drive, helping to control gland enlargement.

How It Works

  • Levothyroxine is a synthetic form of the endogenous hormone thyroxine (T4). After oral absorption, it is converted in peripheral tissues to the active hormone triiodothyronine (T3). Both T4 and T3 bind nuclear thyroid hormone receptors, modulating gene transcription that regulates metabolism, growth, and development, thereby lowering elevated thyroid‑stimulating hormone (TSH) secretion and restoring euthyroid status.

Side Effects

Levothyroxine may cause a range of adverse reactions, varying from mild to serious.

Common Side Effects

  • Headache
  • Insomnia
  • Palpitations
  • Nausea

Serious or Rare Side Effects

  • Cardiac arrhythmias
  • Angina or chest pain
  • Severe allergic reactions (rash, angioedema)

Precautions & Warnings

When prescribing or dispensing Levothyroxine, consider the following precautions:

  • Dose titration: adjust dose based on TSH levels and clinical response.
  • Cardiovascular monitoring: assess heart rate and rhythm in patients with cardiac disease.
  • Pregnancy and lactation: use only if clearly needed, after risk‑benefit assessment.
  • Drug interactions: review concomitant medications that may affect thyroid hormone levels.
  • Adherence: take consistently on an empty stomach, preferably 30‑60 minutes before breakfast.
  • Store at room temperature: keep in original container, protect from moisture and light.

Avoid Interactions

Levothyroxine can interact with several medicines, requiring caution.

Major Interactions (Avoid)

  • Calcium or iron supplements: markedly reduce levothyroxine absorption.
  • Antacids containing aluminum or magnesium: decrease bioavailability.
  • Amiodarone: may alter thyroid hormone metabolism and increase risk of hypo‑ or hyperthyroidism.

Moderate Interactions (Monitor Closely)

  • Warfarin: levothyroxine may enhance anticoagulant effect; monitor INR.
  • SSRIs (selective serotonin reuptake inhibitors): may require levothyroxine dose adjustment.
  • Diabetes medications: changes in thyroid status can affect glucose control.

Frequently Asked Questions

L-Thyrox contains levothyroxine, a synthetic thyroid hormone used to treat hypothyroidism, provide hormone replacement after thyroidectomy, manage congenital hypothyroidism in infants, and help control goiter by normalising thyroid hormone levels.

Levothyroxine is a synthetic form of thyroxine (T4). After oral absorption it is converted to the active hormone triiodothyronine (T3) in peripheral tissues. Both hormones bind nuclear thyroid receptors, regulating gene expression that controls metabolism and suppresses excess TSH production.

The appropriate dose of L-Thyrox is individualized by the prescribing clinician based on the patient’s age, weight, severity of thyroid deficiency, and regular monitoring of serum TSH and free T4 levels. No fixed regimen is provided here.

Levothyroxine is generally considered the treatment of choice for hypothyroidism in pregnancy and lactation when clinically indicated, as untreated thyroid deficiency can harm both mother and fetus. Use only under medical supervision after weighing benefits against any potential risks.

To order L-Thyrox, 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 import documentation.

L-Thyrox provides levothyroxine, the same active ingredient found in most thyroid hormone replacement tablets. Differences among products may relate to formulation excipients, bioavailability, and regulatory approvals. Clinical efficacy is comparable when doses are appropriately titrated.

Store L-Thyrox at room temperature, preferably below 25 °C, in its original packaging. Protect the tablets from moisture, direct sunlight and excessive heat to maintain potency throughout the shelf‑life.

L-Thyrox is taken orally, usually once daily on an empty stomach, at least 30‑60 minutes before breakfast. Swallow the tablet whole with a glass of water; do not crush or chew unless specifically instructed by a healthcare professional.

Serious risks include cardiac arrhythmias, angina or chest pain, and severe allergic reactions such as rash or angioedema. These events are uncommon but require immediate medical attention if they occur.

L-Thyrox should be avoided in individuals with known hypersensitivity to levothyroxine or any of its excipients, and in patients with untreated adrenal insufficiency or acute myocardial infarction until these conditions are stabilized.

Published by

GNH India Pharmaceuticals Limited

Licensed pharmaceutical supplier

Last updated:

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