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

L-Thyroxin Jod Winthrop

Active Ingredient:
Levothyroxine Sodium, Potassium Iodide
Origin:
EU

L-Thyroxin Jod Winthrop (Levothyroxine Sodium, Potassium Iodide)

Levothyroxine sodium, the active ingredient in L-Thyroxin Jod Winthrop, is a thyroid hormone replacement presented as an oral dosage form for oral use. It replaces deficient thyroid hormone in patients with hypothyroidism, supports thyroid hormone replacement therapy, and helps manage goiter.

GNH India supplies L-Thyroxin Jod Winthrop as a licensed, GDP‑compliant international pharmaceutical supplier serving hospitals, pharmacies and clinics worldwide. The company adheres to stringent quality standards and provides reliable logistics for global distribution. All batches are manufactured under EU GMP guidelines and undergo rigorous testing before release.

Manufacturer / TM Owner

Sanofi-Aventis Deutschland Gmbh

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Indications & Clinical Uses

L-Thyroxin Jod Winthrop, a synthetic thyroid hormone, is used in conditions affecting thyroid hormone production.

  • Hypothyroidism: restores normal metabolic rate and alleviates symptoms such as fatigue and weight gain.
  • Thyroid hormone replacement therapy: maintains euthyroid state after thyroidectomy or radioactive iodine treatment.
  • Goiter: reduces thyroid‑stimulating hormone levels to limit gland enlargement.

How It Works

  • Levothyroxine sodium is a synthetic analogue of the endogenous hormone thyroxine (T4). After oral absorption, it is converted to the active triiodothyronine (T3) within peripheral tissues. The hormone binds to nuclear thyroid hormone receptors, modulating gene transcription that regulates basal metabolic rate, protein synthesis, and growth. By restoring circulating T4 levels systemically and effectively, the drug compensates for deficient thyroid function.

Side Effects

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

Common Side Effects

  • Headache
  • Insomnia
  • Palpitations
  • Weight loss
  • Heat intolerance
  • Tremor

Serious or Rare Side Effects

  • Cardiac arrhythmia or angina
  • Myocardial infarction
  • Osteoporosis or bone loss
  • Severe allergic reaction (anaphylaxis)
  • Adrenal crisis

Precautions & Warnings

When prescribing L-Thyroxin Jod Winthrop, clinicians should observe several safety considerations.

  • Dose adjustment in elderly: start with lower doses and titrate cautiously.
  • Monitor thyroid function tests regularly: adjust dose based on TSH and free T4 levels.
  • Avoid abrupt discontinuation: taper dose to prevent hypothyroid rebound.
  • Caution in cardiovascular disease: assess risk of tachyarrhythmias or angina.
  • Use with caution in adrenal insufficiency: ensure adequate glucocorticoid coverage.
  • Store at ambient temperature: keep in the original pack, protect from moisture.

Avoid Interactions

Levothyroxine interacts with several medicines that can alter its absorption or effect.

Major Interactions (Avoid)

  • Antacids containing aluminum or magnesium: reduce levothyroxine absorption.
  • Calcium supplements: interfere with intestinal uptake of the drug.
  • Iron salts: markedly decrease levothyroxine bioavailability.

Moderate Interactions (Monitor Closely)

  • Estrogen therapy: may increase levothyroxine requirement.
  • Beta‑blockers: can mask symptoms of hyperthyroidism.

Frequently Asked Questions

L-Thyroxin Jod Winthrop contains levothyroxine sodium and potassium iodide and is prescribed to treat hypothyroidism, provide thyroid hormone replacement after thyroidectomy or radioactive iodine therapy, and manage goiter by normalising thyroid hormone levels.

Levothyroxine is a synthetic form of the natural hormone T4. After oral absorption it is converted to the active hormone T3, which binds nuclear thyroid receptors and regulates gene expression that controls metabolism, growth and development.

The dose is individualized by the prescribing clinician based on factors such as the patient’s thyroid function test results, age, weight, cardiovascular status and any co‑existing medical conditions. The prescriber sets the appropriate dosage and titration schedule.

The specific pregnancy category for this product is not listed, but levothyroxine is generally considered safe when required to treat maternal hypothyroidism. The decision to use it during pregnancy or lactation should be made by a qualified health professional.

Enquiries are submitted via the product page on gnhindia.com, where you specify the required quantity. GNH India supplies hospitals, pharmacies and procurement teams worldwide, verifies trade or institutional credentials, and then provides pricing, availability, shipping details and any necessary import documentation.

L-Thyroxin Jod Winthrop is a levothyroxine‑based product, providing a stable T4 source. Alternatives such as liothyronine (T3) act more rapidly but have a shorter half‑life. Levothyroxine is generally preferred for long‑term maintenance because of its predictable pharmacokinetics and once‑daily dosing.

Store the product at ambient temperature, below 25 °C, in its original container. Protect it from moisture and direct sunlight to maintain potency throughout its shelf life.

The medication is taken orally, usually on an empty stomach with a full glass of water, at least 30 minutes before breakfast. Swallow the tablet whole; do not crush or chew it.

Serious adverse events include cardiac arrhythmias, angina, myocardial infarction, severe osteoporosis, and anaphylactic reactions. Patients with pre‑existing heart disease or untreated adrenal insufficiency should be monitored closely.

Individuals with untreated adrenal insufficiency, recent myocardial infarction, uncontrolled hyperthyroidism, or known hypersensitivity to levothyroxine or potassium iodide should avoid this medication.

Published by

GNH India Pharmaceuticals Limited

Licensed pharmaceutical supplier

Last updated:

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