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

Levothyroxine Serb

Active Ingredient:
Levothyroxine Sodium
Origin:
EU

Levothyroxine Serb (Levothyroxine Sodium)

Levothyroxine sodium, the active ingredient in Levothyroxine Serb, is a thyroid hormone presented as an injection solution for intramuscular or intravenous use. It replaces deficient thyroid hormone in patients with primary or secondary hypothyroidism, treats myxedema coma, provides hormone replacement after thyroidectomy, and assists in goiter management.

GNH India supplies Levothyroxine Serb as a licensed, GDP‑compliant international pharmaceutical supplier serving hospitals worldwide. The company adheres to stringent quality standards and provides reliable global distribution to healthcare facilities.

Manufacturer / TM Owner

Serb Sa

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Indications & Clinical Uses

Levothyroxine Serb is used in thyroid hormone replacement therapy to normalize metabolism in various hypothyroid conditions.

  • Primary hypothyroidism: restores normal thyroid hormone levels to relieve fatigue, weight gain, and cold intolerance.
  • Secondary hypothyroidism: compensates for pituitary‑derived hormone deficiency to maintain metabolic balance.
  • Myxedema coma (IV/IM use): provides rapid hormone replacement to reverse life‑threatening metabolic depression.
  • Post‑thyroidectomy replacement: supplies needed hormone after surgical removal of the thyroid gland.
  • Goiter management: helps reduce gland enlargement by normalizing thyroid hormone feedback.

How It Works

  • Levothyroxine sodium is a synthetic form of the endogenous hormone thyroxine (T4). After intramuscular or intravenous administration, it is absorbed into the circulation and converted to the active triiodothyronine (T3) within peripheral tissues. T3 binds nuclear thyroid hormone receptors, modulating gene transcription that controls basal metabolic rate, protein synthesis, and growth, thereby correcting the hormonal deficit present in hypothyroid states.

Side Effects

Levothyroxine Serb may cause adverse reactions, which are categorized by frequency and severity.

Common Side Effects

  • Headache
  • Nausea or vomiting
  • Injection site pain or erythema
  • Transient palpitations or tachycardia

Serious or Rare Side Effects

  • Anaphylactic reaction
  • Severe arrhythmia or chest pain
  • Serum sickness or Stevens‑Johnson syndrome

Precautions & Warnings

When using Levothyroxine Serb, clinicians should observe the following precautions to ensure safe therapy.

  • Dose adjustment: individualize based on thyroid function tests and clinical response.
  • Cardiovascular disease: monitor for tachycardia, angina, or arrhythmias during dose titration.
  • Pregnancy: prescribe only when clearly indicated, as thyroid hormone is essential for fetal development.
  • Elderly patients: start with lower doses and increase slowly to avoid cardiac stress.
  • Drug interactions: review concomitant medications that may alter levothyroxine absorption or effect.
  • Store at 2-8°C: keep refrigerated, protect from light, do not freeze or shake.

Avoid Interactions

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

Major Interactions (Avoid)

  • Levothyroxine + amiodarone: may cause severe thyroid dysfunction requiring close monitoring.
  • Levothyroxine + insulin: increased risk of hypoglycemia due to enhanced metabolic rate.
  • Levothyroxine + warfarin: can alter INR, necessitating anticoagulation monitoring.

Moderate Interactions (Monitor Closely)

  • Levothyroxine + antacids, calcium or iron supplements: reduce levothyroxine absorption, timing separation recommended.
  • Levothyroxine + estrogen therapy: may increase levothyroxine requirement, requiring dose adjustment.
  • Levothyroxine + cholestyramine or colestipol: may decrease drug effectiveness, monitor thyroid levels.

Frequently Asked Questions

Levothyroxine Serb is an injectable formulation of levothyroxine sodium used to replace deficient thyroid hormone in patients with primary or secondary hypothyroidism, to treat myxedema coma, to provide hormone replacement after thyroidectomy, and to assist in the management of goiter.

Levothyroxine sodium is a synthetic form of thyroxine (T4). After injection, it is converted to the active hormone triiodothyronine (T3) in peripheral tissues. T3 binds to nuclear thyroid hormone receptors, regulating gene expression that controls basal metabolic rate, protein synthesis, and growth, thereby correcting the hormonal deficit.

The appropriate dose is determined by the prescribing clinician based on the patient’s thyroid function test results, clinical condition, age, weight, and any co‑existing medical issues. Dosage is individualized and adjusted over time to maintain target hormone levels.

Levothyroxine is classified as essential for fetal development, but its use during pregnancy should be limited to situations where the benefit outweighs any potential risk. Breastfeeding mothers should consult their healthcare provider, as levothyroxine is excreted in small amounts in milk.

To order Levothyroxine Serb, submit an enquiry on the product page at gnhindia.com specifying the required quantity. GNH India supplies hospitals, pharmacies, and procurement teams worldwide, verifies trade or institutional credentials, and then provides pricing, availability, shipping details (including cold‑chain handling if needed), and import documentation.

Levothyroxine Serb is a sterile injectable form, offering rapid systemic availability compared with oral tablets that require gastrointestinal absorption. It is particularly useful in emergencies such as myxedema coma or when oral administration is not feasible, whereas oral levothyroxine is preferred for routine long‑term management.

Levothyroxine Serb should be stored at 2‑8 °C (refrigerated). Keep the vials in their original packaging, protect them from light, and avoid freezing or shaking the solution to maintain stability.

The product is administered by a qualified healthcare professional via intramuscular or intravenous injection. The route, injection site, and volume are selected based on the clinical indication and patient condition, following aseptic technique and manufacturer guidelines.

Serious adverse reactions include anaphylaxis, severe cardiac arrhythmias or chest pain, and rare immune‑mediated conditions such as serum sickness or Stevens‑Johnson syndrome. Immediate medical attention is required if any of these symptoms occur.

Levothyroxine Serb should be avoided in patients with known hypersensitivity to levothyroxine or any component of the formulation. Caution is also advised for individuals with uncontrolled cardiovascular disease, adrenal insufficiency, or those receiving medications that may cause dangerous interactions.

Published by

GNH India Pharmaceuticals Limited

Licensed pharmaceutical supplier

Last updated:

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