Product image of Letrozole supplied by GNH India

Letrozole

Active Ingredient:
Letrozole
Origin:
EU

Letrozole

Letrozole, the active ingredient in Letrozole, is an aromatase inhibitor presented as a tablet for oral use. It treats hormone receptor‑positive breast cancer in postmenopausal women by lowering estrogen levels.
GNH India supplies Letrozole as a licensed, GDP‑compliant international pharmaceutical supplier serving oncology centres worldwide.

Manufacturer / TM Owner

Krka, D.D., Novo Mesto

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Indications & Clinical Uses

Letrozole acts on estrogen‑dependent pathways, primarily in breast cancer management.

  • Hormone receptor‑positive breast cancer in postmenopausal women: reduces estrogen production to inhibit tumor growth.
  • Metastatic hormone‑receptor positive breast cancer: helps control disease progression in advanced stages.
  • Adjunct therapy for ovulation induction (off‑label): lowers estrogen feedback to facilitate gonadotropin release.

How It Works

  • Letrozole selectively and reversibly inhibits the aromatase enzyme, which converts androgens to estrogens in peripheral tissues. By blocking this conversion, systemic estrogen concentrations fall, depriving estrogen‑dependent tumor cells of a growth stimulus and thereby slowing or halting cancer progression.

Side Effects

Letrozole may cause a range of adverse reactions.

Common Side Effects

  • Hot flashes
  • Joint and muscle pain
  • Fatigue
  • Nausea
  • Headache
  • Dizziness

Serious or Rare Side Effects

  • Severe liver injury
  • Osteoporotic fractures
  • Deep vein thrombosis or pulmonary embolism
  • Cardiac arrhythmias
  • Anaphylactic or severe allergic reactions
  • Hypercholesterolemia

Precautions & Warnings

When prescribing Letrozole, clinicians should consider several safety measures.

  • Monitor bone health: assess osteoporosis risk and consider calcium/vitamin D supplementation.
  • Assess liver function: periodic liver enzyme testing is recommended.
  • Evaluate cardiovascular status: review history of thromboembolic events.
  • Contraindicated in pregnancy: teratogenic risk mandates strict avoidance.
  • Use only in postmenopausal women: not indicated for premenopausal patients.
  • Store at ambient temperature: keep below 25°C, protect from moisture in the original packaging.

Avoid Interactions

Letrozole can interact with several drug classes, requiring careful management.

Major Interactions (Avoid)

  • Estrogen replacement therapy: may counteract Letrozole’s efficacy.
  • Strong CYP2C19 inhibitors (e.g., fluconazole): increase plasma concentrations.
  • Strong CYP3A4 inducers (e.g., rifampicin): reduce drug exposure.

Moderate Interactions (Monitor Closely)

  • Warfarin: may enhance anticoagulant effect; monitor INR.
  • Anticonvulsants (e.g., carbamazepine): may lower Letrozole levels, requiring efficacy monitoring.

Frequently Asked Questions

Letrozole is prescribed primarily for hormone‑receptor positive breast cancer in postmenopausal women. It is used in both early‑stage adjuvant settings and in metastatic disease to reduce estrogen‑driven tumor growth. Occasionally, it is employed off‑label to aid ovulation induction by lowering estrogen feedback.

Letrozole works by selectively and reversibly inhibiting the aromatase enzyme, which converts adrenal and ovarian androgens into estrogens. This inhibition leads to a marked reduction in circulating estrogen levels, depriving estrogen‑dependent cancer cells of a key growth signal.

The dosage of Letrozole is determined by the prescribing clinician based on the patient’s condition, disease stage, and treatment protocol. Typical regimens involve a once‑daily oral tablet, but the exact strength and schedule are set by the healthcare provider.

Letrozole is classified as Pregnancy Category X, indicating it is contraindicated during pregnancy due to known teratogenic risk. It is also not recommended for breastfeeding women because it may pass into milk and affect the infant.

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

Letrozole, anastrozole, and exemestane belong to the same class of aromatase inhibitors. Letrozole is often chosen for its potent and sustained estrogen suppression, while anastrozole has a similar efficacy profile with a slightly different side‑effect spectrum. Exemestane is a steroidal inhibitor and may be preferred in patients who have progressed on non‑steroidal agents.

Letrozole tablets should be stored at ambient temperature, below 25 °C, in their original blister or container to protect from moisture and light. Keep the product out of reach of children and avoid storing in bathrooms or other humid environments.

Letrozole is taken orally as a tablet, usually with a glass of water. It can be taken with or without food, but consistency in administration (same conditions each day) helps maintain stable drug levels.

Serious risks include severe liver injury, osteoporotic fractures, deep‑vein thrombosis or pulmonary embolism, and rare but life‑threatening allergic reactions. Patients should be monitored for signs of hepatic dysfunction, bone density loss, and any sudden cardiovascular symptoms.

Letrozole is contraindicated in premenopausal women, pregnant or breastfeeding individuals, and patients with known hypersensitivity to the drug. It should also be avoided in patients with uncontrolled liver disease or a history of severe thromboembolic events unless the benefits outweigh the risks.

Published by

GNH India Pharmaceuticals Limited

Licensed pharmaceutical supplier

Last updated:

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