Package: 100 tabs (10mg/tab)

Active Substance: Tamoxifen Citrate

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Tamoxifen, produced by SP-Laboratories, is an oral medication widely recognized for its effectiveness in treating breast cancer. As a selective estrogen receptor modulator (SERM), Tamoxifen blocks the effects of estrogen in certain tissues, making it a powerful tool in combating estrogen receptor-positive breast cancer. Beyond its primary medical use, Tamoxifen is also popular in the bodybuilding community, where it is utilized during Post Cycle Therapy (PCT) to help restore natural testosterone production after a cycle of anabolic steroids. This dual functionality highlights Tamoxifen’s versatility and importance in both clinical and athletic settings.


Tamoxifen is primarily indicated for the treatment and prevention of breast cancer. It is particularly effective against estrogen receptor-positive breast cancer, where it helps prevent the growth and spread of cancer cells by blocking estrogen receptors. Tamoxifen is also used as a preventive measure for high-risk individuals, reducing the likelihood of developing breast cancer. In the bodybuilding world, Tamoxifen is indicated for use during Post Cycle Therapy. After a cycle of anabolic steroids, athletes use Tamoxifen to stimulate natural testosterone production, counteract estrogen-related side effects like gynecomastia, and help restore hormonal balance.


While Tamoxifen is highly effective, it is not suitable for everyone. Individuals with a history of blood clots, deep vein thrombosis (DVT), or pulmonary embolism should avoid this medication due to the increased risk of thromboembolic events. Tamoxifen is also contraindicated for pregnant or breastfeeding women, as it can harm the fetus or infant. People with liver disease or a history of severe allergic reactions to Tamoxifen or its ingredients should not use this medication. Consulting a healthcare professional before starting Tamoxifen is essential to ensure it is safe based on your health history.


Tamoxifen is administered orally, typically in tablet form. The dosage and duration of use depend on the individual’s condition and treatment goals. For breast cancer treatment, the usual dose ranges from 20 to 40 mg per day, taken for five years or as directed by a healthcare provider. In the context of Post Cycle Therapy, bodybuilders often start with a higher dose, such as 40 mg per day, for the first two weeks, followed by a lower dose of 20 mg per day for the next two to four weeks. It is crucial to follow the prescribed dosage and administration schedule to achieve the desired therapeutic effect while minimizing potential side effects.

Medical Action

Tamoxifen works by binding to estrogen receptors in breast tissue, blocking the effects of estrogen. This action inhibits the growth of estrogen receptor-positive breast cancer cells. In Post Cycle Therapy, Tamoxifen’s ability to block estrogen receptors helps prevent estrogen-related side effects such as gynecomastia, a condition where males develop enlarged breast tissue. By blocking estrogen receptors in the hypothalamus and pituitary gland, Tamoxifen stimulates the release of luteinizing hormone (LH) and follicle-stimulating hormone (FSH), which in turn promotes the production of natural testosterone. This process helps restore hormonal balance after a cycle of anabolic steroids.


Before starting Tamoxifen, a thorough medical evaluation is necessary. Regular monitoring of liver function and blood counts is recommended to detect any potential adverse effects early. Individuals should inform their healthcare provider about any other medications they are taking, as Tamoxifen can interact with certain drugs, particularly blood thinners and other hormone treatments. It is also essential to be aware of the increased risk of blood clots associated with Tamoxifen and to report any symptoms of thromboembolic events, such as swelling, pain in the legs, or shortness of breath, immediately.

Side Effects

Like any medication, Tamoxifen can cause side effects. Common side effects include hot flashes, night sweats, nausea, fatigue, and mood swings. These symptoms are usually mild and tend to diminish with continued use. More severe side effects may include blood clots, stroke, and endometrial cancer. Tamoxifen can also cause visual disturbances and cataracts in some individuals. If any severe or persistent side effects occur, it is important to seek medical attention immediately. Regular follow-ups with a healthcare provider are crucial to monitor for any adverse effects and to adjust the treatment plan as needed.


An overdose of Tamoxifen can lead to serious health complications. Symptoms of overdose may include severe nausea, vomiting, dizziness, and unusual bleeding or bruising. In extreme cases, it can cause liver damage and thromboembolic events such as deep vein thrombosis or pulmonary embolism. If an overdose is suspected, it is crucial to seek emergency medical help immediately. Treatment typically involves supportive care, including monitoring of vital signs and administration of medications to counteract the effects of the overdose. Adhering strictly to the prescribed dosage and administration guidelines can prevent the risk of overdose.


Tamoxifen from SP-Laboratories is a versatile oral medication that plays a vital role in both the treatment of estrogen receptor-positive breast cancer and the management of hormonal balance during Post Cycle Therapy for bodybuilders. Its ability to block estrogen receptors and stimulate natural testosterone production makes it an invaluable tool for achieving therapeutic and performance goals. However, it is essential to use Tamoxifen responsibly and under the supervision of a healthcare professional. Understanding the indications, contra-indications, proper administration, and potential side effects can help users maximize the benefits while minimizing risks. Always consult with a healthcare provider before starting any new medication to ensure it is appropriate for your individual health needs.


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