Product image of Nolvadex (Tamoxifen Citrate) supplied by GNH India

Nolvadex

Active Ingredient:
Tamoxifen Citrate
Origin:
EU

Nolvadex (Tamoxifen Citrate)

Tamoxifen Citrate, the active ingredient in Nolvadex, is a selective estrogen receptor modulator presented as an oral formulation for oral use. It is employed to treat estrogen receptor‑positive breast cancer and to prevent gynecomastia in men receiving certain hormonal therapies.

GNH India supplies Nolvadex as a licensed, GDP‑compliant international pharmaceutical supplier serving oncology centres, hospitals and pharmacies worldwide, with robust quality assurance and regulatory compliance. Our distribution network ensures timely delivery and adherence to local import requirements across Europe, Asia, Africa and the Americas.

Manufacturer / TM Owner

Astrazeneca S.A

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Indications & Clinical Uses

  • Nolvadex (tamoxifen citrate) is used in hormone‑responsive cancers and related conditions, acting on estrogen pathways.
  • Estrogen receptor‑positive breast cancer (adjuvant and metastatic): reduces tumor growth and lowers risk of disease recurrence.
  • Prevention of breast cancer recurrence: administered after primary therapy to maintain remission.
  • Gynecomastia prophylaxis in men receiving certain hormonal therapies: helps prevent development of breast tissue enlargement.

How It Works

  • Tamoxifen citrate binds competitively to estrogen receptors in breast and other tissues, acting as an antagonist in breast tissue while exhibiting partial agonist activity elsewhere. By occupying the receptor binding site, it blocks estrogen‑driven transcriptional activation, thereby inhibiting proliferation of estrogen‑dependent tumor cells and reducing estrogen‑mediated growth signals. The drug’s metabolite, 4‑hydroxytamoxifen, has higher affinity for the receptor, contributing to its therapeutic potency.

Side Effects

Tamoxifen citrate may cause a range of adverse reactions, varying from mild to serious.

Common Side Effects

  • Hot flashes: transient feeling of warmth and sweating.
  • Nausea: mild to moderate stomach upset.
  • Fatigue: generalized tiredness.
  • Menstrual irregularities: changes in cycle length or flow.

Serious or Rare Side Effects

  • Thromboembolic events: deep vein thrombosis or pulmonary embolism.
  • Endometrial cancer: abnormal uterine bleeding or malignancy.
  • Liver function abnormalities: elevated enzymes or hepatitis.
  • Visual disturbances: blurred vision or retinal changes.

Precautions & Warnings

When prescribing tamoxifen, clinicians should observe several safety measures.

  • Liver monitoring: assess hepatic function before and during therapy.
  • Thromboembolic risk assessment: evaluate history of clotting disorders.
  • Uterine evaluation: perform baseline gynecologic exam for endometrial risk.
  • Pregnancy avoidance: contraindicated in pregnancy; use effective contraception.
  • Concomitant estrogen avoidance: do not combine with estrogen‑containing products.
  • Store at ambient temperature: keep below 25 °C in original container, protect from moisture.

Avoid Interactions

Tamoxifen interacts with several medicines that may alter its efficacy or safety.

Major Interactions (Avoid)

  • Estrogen‑containing hormonal therapies: may diminish tamoxifen efficacy.
  • Strong CYP3A4 inhibitors (e.g., ketoconazole, itraconazole): increase plasma levels and toxicity.
  • Warfarin: tamoxifen may potentiate anticoagulant effect, increasing bleeding risk.

Moderate Interactions (Monitor Closely)

  • CYP2D6 inhibitors (e.g., paroxetine, fluoxetine): reduce conversion to active metabolite, lowering effectiveness.
  • St. John’s wort: induces CYP3A4, potentially decreasing tamoxifen exposure.

Frequently Asked Questions

Nolvadex, whose active ingredient is tamoxifen citrate, is prescribed for estrogen receptor‑positive breast cancer in both adjuvant and metastatic settings, to help prevent recurrence after primary treatment, and to reduce the risk of gynecomastia in men receiving certain hormonal therapies.

Tamoxifen citrate acts as a selective estrogen receptor modulator. It binds competitively to estrogen receptors in breast tissue, blocking estrogen‑driven signaling that promotes tumor cell growth, while its metabolites retain higher affinity for the receptor, enhancing the anti‑estrogenic effect.

The dosage of Nolvadex is individualized by the prescribing clinician based on the specific indication, patient characteristics, and treatment protocol. Dosing regimens are established by oncologists or qualified healthcare professionals and should not be altered without medical guidance.

Tamoxifen citrate is generally contraindicated in pregnancy because it may cause fetal harm. Women of child‑bearing potential should use effective contraception during treatment and for a period after discontinuation. Safety during breastfeeding has not been established, and breastfeeding is usually discouraged.

To request Nolvadex, 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 and any necessary import documentation.

Nolvadex belongs to the selective estrogen receptor modulator class, differing from aromatase inhibitors and pure anti‑estrogens. While aromatase inhibitors lower systemic estrogen levels, tamoxifen blocks estrogen receptors directly in breast tissue, offering an alternative mechanism that may be preferred in pre‑menopausal patients or specific clinical scenarios.

Nolvadex should be stored at ambient temperature, preferably below 25 °C, in its original packaging to protect it from moisture and light. Keep the product out of reach of children and avoid storing it in areas with high humidity or temperature fluctuations.

Nolvadex is taken orally, usually as a tablet, with or without food as directed by the prescriber. Patients should swallow the tablet whole with a glass of water and follow the dosing schedule provided by their healthcare professional.

Serious risks include thromboembolic events such as deep‑vein thrombosis or pulmonary embolism, the development of endometrial cancer, significant liver function abnormalities, and rare severe allergic reactions. Patients should be monitored regularly for signs of these conditions and report any concerning symptoms promptly.

Nolvadex is contraindicated in individuals with a known hypersensitivity to tamoxifen or any of its excipients, in pregnant women, and in patients with a history of thromboembolic disorders unless the benefits outweigh the risks. Clinicians should also avoid use in patients receiving estrogen‑containing therapies without careful assessment.

Published by

GNH India Pharmaceuticals Limited

Licensed pharmaceutical supplier

Last updated:

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