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

L-Thyroxin Serb

Active Ingredient:
Levothyroxine Sodium
Origin:
EU

L-Thyroxin Serb (Levothyroxine Sodium)

Levothyroxine Sodium, the active ingredient in L-Thyroxin Serb, is a synthetic thyroid hormone presented as a sterile injectable solution for intravenous or intramuscular administration. It replaces deficient endogenous thyroxine (T4) and restores normal hormone levels in patients diagnosed with hypothyroidism or who have undergone thyroidectomy, helping to normalize metabolism and physiological function.

GNH India supplies L-Thyroxin Serb as a licensed, GDP‑compliant international pharmaceutical product. The company provides reliable sourcing to hospitals, transplant centres, and pharmacy networks across global markets, ensuring quality‑assured deliveries that meet regulatory standards for sterile injectable medicines.

Manufacturer / TM Owner

Serb Sa

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Indications & Clinical Uses

  • Levothyroxine Sodium is used to replace deficient thyroid hormone in disorders of the thyroid gland.
  • Hypothyroidism: Levothyroxine restores normal circulating T4 levels, alleviating symptoms such as fatigue, weight gain, and cold intolerance by normalizing metabolic rate.
  • Thyroid hormone replacement after thyroidectomy: The drug supplies the missing thyroxine, supporting basal metabolic processes and preventing hypothyroid complications in patients who have had their thyroid gland removed.
  • Goiter: By providing adequate thyroid hormone, levothyroxine reduces TSH stimulation of the thyroid gland, helping to decrease gland size and prevent further enlargement.

How It Works

  • Levothyroxine is a synthetic analogue of the endogenous hormone thyroxine (T4). After absorption or direct injection, it binds to thyroid hormone receptors in the nucleus of target cells, where it is converted to the active form triiodothyronine (T3). The hormone‑receptor complex then modulates gene transcription, influencing basal metabolic rate, protein synthesis, and development of multiple organ systems and cardiovascular function.

Side Effects

Levothyroxine may cause a range of adverse reactions, which are categorized by frequency and severity.

Common Side Effects

  • Headache: mild to moderate pain in the head.
  • Insomnia: difficulty falling or staying asleep.
  • Palpitations: awareness of rapid or irregular heartbeat.
  • Nervousness: increased anxiety or jitteriness.
  • Weight loss: unintended reduction in body weight.

Serious or Rare Side Effects

  • Cardiac arrhythmia: abnormal heart rhythm that may be life‑threatening.
  • Angina pectoris: chest pain due to reduced coronary blood flow.
  • Myocardial infarction: heart attack resulting from prolonged arrhythmia.
  • Osteoporosis: decreased bone density with long‑term overtreatment.
  • Anaphylaxis: severe allergic reaction with rash, swelling, and breathing difficulty.

Precautions & Warnings

When using levothyroxine, several safety considerations should be observed.

  • Thyroid function monitoring: regular TSH and free T4 tests are required to adjust dose.
  • Elderly dosing: start with lower doses and titrate slowly to avoid cardiac stress.
  • Cardiovascular disease: use cautiously in patients with angina or arrhythmias.
  • Adrenal insufficiency: ensure adequate glucocorticoid replacement before initiating levothyroxine.
  • Pregnancy and lactation: discuss risks with healthcare provider before use.
  • Store at room temperature: keep in original container, protect from moisture and light.

Avoid Interactions

Levothyroxine interacts with several medicines that may alter its effectiveness or safety.

Major Interactions (Avoid)

  • Antacids (aluminum, magnesium): reduce levothyroxine absorption if taken concurrently.
  • Calcium supplements: bind levothyroxine and decrease its bioavailability.
  • Iron salts: interfere with absorption leading to subtherapeutic levels.
  • Warfarin: levothyroxine may enhance anticoagulant effect and increase INR.
  • Amiodarone: can potentiate thyroid hormone activity and cause thyrotoxicosis.

Moderate Interactions (Monitor Closely)

  • Beta‑blockers: may mask symptoms of excess thyroid hormone.
  • Oral contraceptives: may increase levothyroxine requirement.
  • Statins: possible alteration of thyroid hormone metabolism; monitor thyroid function.

Frequently Asked Questions

L-Thyroxin Serb contains levothyroxine sodium, which is prescribed to replace deficient thyroid hormone in patients with hypothyroidism, to provide thyroid hormone after thyroidectomy, and to manage goiter by normalizing thyroid‑stimulating hormone levels.

Levothyroxine is a synthetic form of thyroxine (T4). After administration it enters cells, binds nuclear thyroid hormone receptors, and is converted to the active hormone triiodothyronine (T3). This hormone‑receptor complex regulates gene expression, influencing metabolism, growth, and organ function.

The dose of levothyroxine is individualized. A qualified prescriber determines the appropriate amount based on the patient’s age, weight, severity of hypothyroidism, cardiac status, and laboratory thyroid function tests. No standard dosing regimen is provided here.

Levothyroxine is classified as a pregnancy‑category drug only after risk‑benefit assessment. It may be continued during pregnancy if needed to maintain maternal euthyroidism, which is important for fetal development. Breastfeeding mothers should consult their healthcare provider, as small amounts can pass into milk.

To place an enquiry, visit the product page at gnhindia.com, enter the required quantity, and submit the request. GNH India works with hospitals, pharmacies, and procurement teams worldwide, verifies trade or institutional credentials, and then provides pricing, availability, shipping details (including cold‑chain if required) and import documentation.

Levothyroxine is the standard synthetic T4 replacement, whereas alternatives such as liothyronine (T3) provide a more rapid but shorter‑acting effect. Levothyroxine offers stable, long‑term hormone levels and is preferred for most patients. Combination therapy may be considered in specific cases under specialist guidance.

Store the injectable solution at room temperature, preferably below 25 °C. Keep the vial in its original packaging, protect it from moisture and direct sunlight, and avoid freezing. Follow aseptic techniques when preparing for administration.

L-Thyroxin Serb is supplied as a sterile solution for intravenous or intramuscular injection. Administration is performed by a qualified healthcare professional using appropriate aseptic technique, and the dose is adjusted according to the patient’s thyroid function test results.

Serious adverse events include cardiac arrhythmias, angina, myocardial infarction, severe osteoporosis from overtreatment, and anaphylactic reactions. Patients with pre‑existing heart disease or those receiving high doses should be monitored closely for these potentially life‑threatening complications.

Levothyroxine is contraindicated in patients with known hypersensitivity to levothyroxine or any excipients in the formulation, and in individuals with untreated adrenal insufficiency. Caution is advised for patients with recent myocardial infarction, uncontrolled thyrotoxicosis, or severe cardiovascular disease.

Published by

GNH India Pharmaceuticals Limited

Licensed pharmaceutical supplier

Last updated:

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