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

Levothyroxine Zentiva

Active Ingredient:
Levothyroxine Sodium
Origin:
EU

Levothyroxine Zentiva (Levothyroxine Sodium)

Levothyroxine Sodium, the active ingredient in Levothyroxine Zentiva, is a thyroid hormone replacement presented as a tablet for oral use. It provides exogenous thyroxine (T4) to compensate for deficient endogenous hormone, thereby normalizing metabolic activity in patients diagnosed with hypothyroidism, goiter, or requiring hormone replacement following thyroidectomy.

GNH India supplies Levothyroxine Zentiva as a licensed, GDP‑compliant international pharmaceutical supplier serving hospitals, pharmacies and clinics worldwide, ensuring quality‑assured product availability across global markets. The company adheres to EU GMP standards and provides regulatory documentation to support import and clinical use.

Manufacturer / TM Owner

Zentiva Pharma Uk Limited

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Indications & Clinical Uses

Levothyroxine Zentiva is used in thyroid hormone replacement therapy to correct deficient thyroid function.

  • Hypothyroidism: restores normal thyroid hormone levels, alleviating symptoms such as fatigue, weight gain, and cold intolerance.
  • Goiter: reduces thyroid gland enlargement by normalizing hormone feedback mechanisms.
  • Post‑thyroidectomy: provides necessary thyroxine to maintain metabolic balance after surgical removal of the thyroid.

How It Works

  • Levothyroxine Sodium 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, binding to nuclear thyroid hormone receptors. This interaction modulates gene transcription, increasing basal metabolic rate, protein synthesis, and sympathetic nervous system activity, thereby compensating for deficient thyroid hormone production.

Side Effects

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

Common Side Effects

  • Headache: mild to moderate headache may occur, especially after dose changes.
  • Insomnia: difficulty sleeping can be reported, often related to excess hormone levels.
  • Palpitations: sensation of rapid or irregular heartbeat.
  • Heat intolerance: increased sensitivity to warm environments.
  • Tremor: fine shaking of hands or limbs.
  • Weight loss: unintended loss of body weight.

Serious or Rare Side Effects

  • Angioedema: swelling of face, lips, tongue, or throat requiring immediate medical attention.
  • Chest pain: may indicate cardiac ischemia, especially in patients with coronary disease.
  • Arrhythmia: abnormal heart rhythms, including atrial fibrillation.
  • Severe allergic reaction: rash, itching, or anaphylaxis.
  • Osteoporosis: long‑term excess hormone may reduce bone mineral density.

Precautions & Warnings

Before initiating therapy, several safety considerations should be reviewed.

  • Dose adjustment: monitor serum TSH and free T4 levels and titrate dose accordingly.
  • Cardiovascular disease: use caution in patients with coronary artery disease or arrhythmias.
  • Pregnancy: evaluate risk‑benefit ratio; levothyroxine is generally continued if already prescribed.
  • Elderly: start with a lower dose and increase gradually to avoid overtreatment.
  • Drug interactions: review concomitant medications that may affect absorption or metabolism.
  • Store at room temperature: keep in the original container, protect from moisture and light.

Avoid Interactions

Levothyroxine can interact with several medicines, influencing its efficacy or safety.

Major Interactions (Avoid)

  • Amiodarone: may increase thyroid hormone levels, risking thyrotoxicosis.
  • Warfarin: levothyroxine can enhance anticoagulant effect, requiring INR monitoring.
  • Antacids/Calcium carbonate: reduce levothyroxine absorption; separate dosing by at least 4 hours.

Moderate Interactions (Monitor Closely)

  • Estrogen therapy: may increase levothyroxine requirement.
  • Cholestyramine: can decrease levothyroxine absorption.
  • Beta‑blockers: may mask symptoms of excess thyroid hormone.

Frequently Asked Questions

Levothyroxine Zentiva is prescribed to replace deficient thyroid hormone in patients with hypothyroidism, to treat goiter, and to provide hormone replacement after thyroidectomy. It helps normalize metabolism and alleviate symptoms associated with low thyroid function.

Levothyroxine Sodium is a synthetic form of thyroxine (T4). After oral absorption, it is converted to the active hormone triiodothyronine (T3) in peripheral tissues, where it binds nuclear thyroid receptors and regulates gene expression, thereby restoring normal metabolic activity.

The appropriate dose of Levothyroxine Zentiva is individualized by the prescribing clinician based on the patient’s serum TSH, free T4 levels, age, weight, cardiac status, and other clinical factors. Patients should follow the prescriber’s instructions and have regular laboratory monitoring.

Levothyroxine is generally considered safe in pregnancy and breastfeeding when clinically indicated, as untreated hypothyroidism can harm both mother and fetus. The prescriber will weigh the benefits against any potential risks and may adjust the dose to maintain appropriate thyroid hormone levels.

To place an order, 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.

Levothyroxine Zentiva contains the same active ingredient as other levothyroxine brands and is bioequivalent when taken as prescribed. Differences may lie in excipients, tablet size, or manufacturing standards, but therapeutic outcomes are expected to be comparable when dosing is appropriately adjusted.

Store Levothyroxine Zentiva tablets at room temperature, below 25 °C, in the original blister pack or container. Protect them from moisture, excessive heat, and direct sunlight to maintain potency throughout the shelf life.

Levothyroxine Zentiva is taken orally, usually on an empty stomach 30‑60 minutes before breakfast. Swallow the tablet whole with a full glass of water; do not crush or chew it, as this may affect absorption.

Serious risks include cardiac arrhythmias, angioedema, severe allergic reactions, and bone loss (osteoporosis) with long‑term overtreatment. Patients should report chest pain, rapid heartbeat, swelling of the face or throat, or unexplained fractures to a healthcare professional promptly.

Levothyroxine Zentiva should be avoided in individuals with known hypersensitivity to levothyroxine or any tablet excipients. Caution is advised for patients with untreated adrenal insufficiency, recent myocardial infarction, or uncontrolled cardiovascular disease, and dose adjustments are required for the elderly.

Published by

GNH India Pharmaceuticals Limited

Licensed pharmaceutical supplier

Last updated:

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