L-Thyroxin (Anhydrous Levothyroxine Sodium)

Levothyroxine is a synthetic form of the natural hormone thyroxine (T4). After oral absorption, it is converted to the active hormone triiodothyronine (T3) in peripheral tissues. The hormone then binds to nuclear thyroid receptors, regulating gene expression that controls basal metabolism, growth, and protein synthesis.

The appropriate dose of L-Thyroxin is individualized. A qualified prescriber determines the starting dose and any adjustments based on the patient’s age, weight, cardiac status, and thyroid function test results. Patients should follow the prescribing clinician’s instructions and not alter the dose on their own.

Levothyroxine is generally considered safe in pregnancy when indicated, as untreated hypothyroidism can harm both mother and fetus. The prescriber will weigh benefits against potential risks and monitor thyroid levels closely. Limited data are available for breastfeeding, but the drug is excreted in small amounts in milk; clinical judgment is required.

To order L-Thyroxin, submit an enquiry on the product page at gnhindia.com, specifying the required quantity. GNH India supplies hospitals, pharmacies and procurement teams worldwide. After the request, the sales team will verify trade or institutional credentials, then provide pricing, availability, shipping details and any required import documentation.

The main alternative to levothyroxine is liothyronine (synthetic T3) or combination T4/T3 preparations. Levothyroxine provides a stable, long‑acting source of T4, which the body converts to T3 as needed, offering smoother hormone levels. Liothyronine acts more rapidly but may cause greater fluctuations. Choice depends on clinical response, patient preference and physician assessment.

L-Thyroxin tablets should be stored at temperatures below 25 °C, in the original packaging to protect from moisture and light. Keep the product out of reach of children and avoid storing in bathrooms or other humid environments. Do not freeze the tablets.

L-Thyroxin is taken orally, usually once daily on an empty stomach, at least 30 minutes before breakfast or any other medication. The tablet should be swallowed whole with a full glass of water. Patients should follow the specific timing and dosing instructions provided by their healthcare professional.

Serious risks include cardiac arrhythmias, angina, myocardial infarction, and severe bone loss (osteoporosis) especially in patients with pre‑existing heart disease or high doses. Rapid over‑replacement can also precipitate thyrotoxic symptoms. Prompt medical evaluation is required if patients experience chest pain, palpitations, or unexplained fractures.

L-Thyroxin is contraindicated in patients with known hypersensitivity to levothyroxine or any of the tablet excipients. It should be used with caution, or avoided, in individuals with untreated adrenal insufficiency, acute myocardial infarction, or uncorrected thyrotoxicosis. Pregnant or breastfeeding women should only use it under close medical supervision.