L-Thyroxine Serb (Levothyroxine Sodium)

Levothyroxine is a synthetic form of the natural hormone T4. After administration, it is converted to the active hormone T3 in peripheral tissues. The hormone binds to nuclear thyroid receptors, influencing gene transcription that regulates basal metabolic rate, protein synthesis, and development, thereby compensating for the body's lack of thyroid hormone.

The appropriate dose of levothyroxine is individualized and set by the prescribing clinician based on factors such as age, weight, severity of deficiency, and laboratory values (TSH, free T4). Dosage may be adjusted over time to maintain target thyroid hormone levels.

Levothyroxine is classified as a pregnancy‑category drug where the benefits usually outweigh potential risks when maternal hypothyroidism is present. Adequate thyroid hormone is essential for fetal development, so treatment is often continued. Limited data exist for breastfeeding, but the drug is generally considered compatible; clinicians should monitor maternal and infant thyroid status.

To place an order, visit the product page on gnhindia.com and submit an enquiry with the required quantity. GNH India supplies hospitals, pharmacies, and procurement teams worldwide. After submission, the sales team will verify trade or institutional credentials, then provide pricing, availability, shipping details (including cold‑chain if needed), and assist with import documentation.

Levothyroxine provides a stable, synthetic T4 source, whereas alternatives such as liothyronine (synthetic T3) or natural desiccated thyroid contain a mixture of hormones. Levothyroxine offers predictable pharmacokinetics and is the standard of care for most hypothyroid patients. Combination therapy with T3 may be considered in select cases, but levothyroxine remains the most widely used and studied option.

Store the injectable product at ambient temperature, preferably below 25 °C. Keep it in the original packaging, protect from moisture and direct light, and avoid freezing. Do not reuse needles or syringes, and follow standard aseptic techniques when preparing for intramuscular or intravenous administration.

L-Thyroxine Serb is supplied as a sterile injectable solution for intramuscular or intravenous injection. The route and rate of administration are determined by the prescriber, typically based on the clinical situation (e.g., routine replacement versus emergency myxedema coma). Proper aseptic technique and appropriate dosing equipment must be used.

Serious adverse events include cardiac arrhythmias such as atrial fibrillation, angina or myocardial infarction, and severe allergic reactions (anaphylaxis). Patients with underlying heart disease, uncontrolled hypertension, or adrenal insufficiency are at higher risk and should be closely monitored during therapy.

Levothyroxine should be avoided in individuals with known hypersensitivity to levothyroxine or any excipients in the formulation. It is also contraindicated in patients with untreated adrenal insufficiency, acute myocardial infarction, or severe thyrotoxicosis until the underlying condition is stabilized.