Product image of Levothyroxine Mercury Pharmaceuticals (Anhydrous Levothyroxine Sodium) supplied by GNH India

Levothyroxine Mercury Pharmaceuticals

Active Ingredient:
Anhydrous Levothyroxine Sodium
Origin:
EU

Levothyroxine Mercury Pharmaceuticals (Anhydrous Levothyroxine Sodium)

Levothyroxine, the active ingredient in Levothyroxine Mercury Pharmaceuticals, is a thyroid hormone presented as an oral tablet for oral use. It replaces deficient thyroid hormone and is used to treat hypothyroidism and related thyroid disorders in adults.

GNH India supplies Levothyroxine Mercury Pharmaceuticals as a licensed, GDP‑compliant international pharmaceutical supplier serving hospitals, pharmacies and clinics worldwide.

Manufacturer / TM Owner

Mercury Pharmaceuticals Ltd.

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Indications & Clinical Uses

  • Levothyroxine acts on the thyroid hormone pathway to restore normal metabolic function in patients with thyroid deficiency.
  • Hypothyroidism: normalizes low thyroid hormone levels and alleviates fatigue, weight gain, and cold intolerance.
  • Goiter: reduces thyroid gland enlargement by providing adequate hormone feedback.
  • Thyroid hormone replacement therapy: maintains euthyroid status after thyroidectomy or radioactive iodine treatment.

How It Works

  • 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 corrects the metabolic disturbances caused by thyroid hormone deficiency.

Side Effects

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

Common Side Effects

  • Palpitations or rapid heartbeat
  • Headache or dizziness
  • Insomnia or nervousness
  • Heat intolerance or excessive sweating
  • Tremor or muscle weakness
  • Gastrointestinal upset such as nausea

Serious or Rare Side Effects

  • Cardiac arrhythmias or angina
  • Severe bone loss leading to fractures
  • Allergic reactions including rash, itching, or swelling
  • Chest pain or shortness of breath
  • Hyperthyroid symptoms from overdose (e.g., anxiety, weight loss)
  • Liver dysfunction or jaundice

Precautions & Warnings

Levothyroxine requires careful monitoring and individualized dosing.

  • Dose adjustment: regularly assess TSH and free T4 levels to guide titration.
  • Cardiovascular disease: use caution in patients with angina or arrhythmias.
  • Elderly patients: initiate therapy at lower doses to avoid overtreatment.
  • Pregnancy and lactation: discuss risks and benefits with a healthcare professional.
  • Drug interactions: review all concomitant medications for potential effects on absorption or metabolism.
  • Store at ambient temperature: keep in the original container, protect from moisture and light.

Avoid Interactions

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

Major Interactions (Avoid)

  • Amiodarone: may increase thyroid hormone levels and precipitate toxicity.
  • Antacids containing aluminum or magnesium: significantly reduce levothyroxine absorption.
  • Warfarin: levothyroxine may enhance anticoagulant effect, requiring INR monitoring.

Moderate Interactions (Monitor Closely)

  • Calcium or iron supplements: decrease levothyroxine absorption; separate dosing by at least 4 hours.
  • Beta‑blockers: may mask signs of excess thyroid hormone.
  • Corticosteroids: can increase hormone metabolism, potentially reducing efficacy.

Frequently Asked Questions

Levothyroxine Mercury Pharmaceuticals is prescribed to replace deficient thyroid hormone in patients with hypothyroidism, to reduce goiter size, and to provide thyroid hormone replacement after thyroidectomy or radioactive iodine therapy. By normalizing hormone levels, it helps restore metabolic balance and alleviate related symptoms.

Levothyroxine is a synthetic form of thyroxine (T4). After oral absorption, it is converted to the active hormone triiodothyronine (T3) in peripheral tissues. Both T4 and T3 bind nuclear thyroid receptors, regulating gene expression that controls basal metabolic rate, protein synthesis, and growth, thereby correcting the metabolic deficits of thyroid hormone deficiency.

The appropriate levothyroxine dose is individualized and determined by the prescribing clinician based on factors such as age, weight, severity of hypothyroidism, and laboratory results (TSH and free T4). Patients should follow the exact dosage instructions provided by their healthcare professional.

Levothyroxine is generally considered safe in pregnancy and lactation when used under medical supervision, as untreated hypothyroidism can harm both mother and fetus. The prescriber will weigh potential benefits against any 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, verifying trade or institutional credentials before providing pricing, availability, shipping details, and any necessary import documentation.

Levothyroxine is the standard synthetic T4 replacement and is preferred for most patients due to its long half‑life and stable serum levels. Alternatives such as liothyronine (synthetic T3) or combination T4/T3 therapy may be used in specific cases, but levothyroxine remains the first‑line choice for routine hypothyroidism management.

Levothyroxine tablets should be stored at ambient temperature, below 25 °C, in their original packaging. Protect them from moisture, excessive heat, and direct sunlight to maintain potency throughout the shelf life.

Levothyroxine is taken orally, usually once daily on an empty stomach, preferably 30–60 minutes before breakfast. The tablet should be swallowed whole with a full glass of water and not crushed or chewed.

Serious risks include cardiac arrhythmias, angina, severe bone loss leading to fractures, and allergic reactions such as rash or swelling. Over‑replacement can cause symptoms of hyperthyroidism, so regular monitoring of thyroid function tests is essential.

Levothyroxine is contraindicated in patients with known hypersensitivity to levothyroxine or any of its excipients. Caution is advised for individuals with untreated adrenal insufficiency, acute myocardial infarction, or uncorrected thyrotoxicosis, as the drug may exacerbate these conditions.

Published by

GNH India Pharmaceuticals Limited

Licensed pharmaceutical supplier

Last updated:

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