Tamoxifen Citrate

Tamoxifen is a medication that belongs to a class of drugs called selective estrogen receptor modulators (SERMs). sold under the brand name Nolvadex among others, is a selective estrogen receptor modulator used to prevent breast cancer in women and men.[ It is also being studied for other types of cancer. It has been used for Albright syndrome.Tamoxifen is typically taken daily by mouth for five years for breast cancer.

Estrogen Receptor Modulation: Tamoxifen works by binding to estrogen receptors in breast tissue, blocking the effects of estrogen. This helps prevent estrogen from stimulating the growth of estrogen receptor-positive breast cancer cells.

Tamoxifen is often used as adjuvant therapy after surgery and other treatments, such as chemotherapy or radiation therapy, to reduce the risk of cancer recurrence.

Tamoxifen is primarily effective in treating breast cancers that are estrogen receptor-positive (ER-positive) or progesterone receptor-positive (PR-positive). It is less effective in tumors that do not express these receptors.

 

 

 

1) Dysmenorrhea:

Tamoxifen has been used effectively to improve blood flow, reduce uterine contractility and pain in dysmenorrhea patients.

2) Breast cancer:

Tamoxifen is used for the treatment of both early and advanced estrogen receptor-positive (ER-positive or ER+) breast cancer in pre- and postmenopausal women. Tamoxifen increases the risk of postmenopausal bleeding, endometrial polyps, hyperplasia, and endometrial cancer; using tamoxifen with an intrauterine system releasing levonorgestrel might increase vaginal bleeding after 1 to 2 years, but reduces somewhat endometrial polyps and hyperplasia, but not necessarily endometrial cancer. Additionally, it is the most common hormone treatment for male breast cancer.It is also approved by the FDA for the prevention of breast cancer in women at high risk of developing the disease. It has been further approved for the reduction of contralateral (in the opposite breast) cancer. The use of tamoxifen is recommended for 10 years.

In 2006, the large STAR clinical study concluded that raloxifene is also effective in reducing the incidence of breast cancer. Updated results after an average of 6.75 years of follow up found that raloxifene retains 76% of tamoxifen's effectiveness in preventing invasive breast cancer, with 45% fewer uterine cancers and 25% fewer blood clots in women taking raloxifene than in women taking tamoxifen.

3) Infertility

Tamoxifen is used for ovulation induction to treat infertility in women with anovulatory disorders. It is given at days three to seven of a woman's cycle.

Tamoxifen improves fertility in males with infertility by disinhibiting the hypothalamic–pituitary–gonadal axis (HPG axis) via ER antagonism and thereby increasing the secretion of luteinizing hormone (LH) and follicle-stimulating hormone (FSH) and increasing testicular testosterone production.

4) Infertility

Tamoxifen is used for ovulation induction to treat infertility in women with anovulatory disorders. It is given at days three to seven of a woman's cycle.

Tamoxifen improves fertility in males with infertility by disinhibiting the hypothalamic–pituitary–gonadal axis (HPG axis) via ER antagonism and thereby increasing the secretion of luteinizing hormone (LH) and follicle-stimulating hormone (FSH) and increasing testicular testosterone production.

5) Early puberty

Tamoxifen is useful in the treatment of peripheral precocious puberty, for instance due to McCune–Albright syndrome, in both girls and boys. It has been found to decrease growth velocity and the rate of bone maturation in girls with precocious puberty, and hence to improve final height in these individuals.

 

 

Tamoxifen is useful in the treatment of peripheral precocious puberty, for instance due to McCune–Albright syndrome, in both girls and boys. It has been found to decrease growth velocity and the rate of bone maturation in girls with precocious puberty, and hence to improve final height in these individuals.

 

 

Tamoxifen is rapidly and extensively absorbed from the intestines with oral administration.The oral bioavailability of tamoxifen is approximately 100%, which is suggestive of minimal first-pass metabolism in the intestines and liver. Following intake, peak levels of tamoxifen occur after three to seven hours. Steady state levels of tamoxifen are reached typically after 3 to 4 weeks but possibly up to 16 weeks of daily administration. Steady state levels of afimoxifene are achieved after 8 weeks of daily tamoxifen administration.Peak levels of tamoxifen after a single 40 mg oral dose were 65 ng/mL and steady state levels at 20 mg/day were 310 ng/mL. Levels of tamoxifen show clear dose dependency across a dosage range of 1 to 20 mg/day. Endoxifen levels are approximately 5 to 10 times higher than afimoxifene levels, with large interindividual variability. Endoxifen levels have been reported as 10.8 to 15.9 ng/mL at steady state in CYP2D6 normal metabolizers during therapy with 20 mg/day tamoxifen.The most abundant metabolites of tamoxifen in terms of circulating concentrations are N-desmethyltamoxifen, N,N-didesmethyltamoxifen, (Z)-endoxifen, and tamoxifen N-oxide.

 

 

Product Name	Nolvadex, Genox, Tamifen
Other Name	TMX; ICI-46474
CAS	10540-29-1
Molar mass	371.524
MF	C26H29NO
Purity	Above 98%
Apprarance	White to Off-White Cyrstalline Powder

 

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Tamoxifen, marketed under the brand name Nolvadex among others, is primarily used for the treatment and prevention of breast cancer. Here are the main uses of tamoxifen (Nolvadex):

Breast Cancer Treatment: Tamoxifen is commonly prescribed as part of the treatment regimen for various types of breast cancer. It is effective in both premenopausal and postmenopausal women. Tamoxifen is often used as adjuvant therapy after surgery to reduce the risk of cancer recurrence and as a treatment for advanced or metastatic breast cancer.

Hormone Receptor-Positive Breast Cancer: Tamoxifen is particularly effective in treating breast cancers that are estrogen receptor-positive (ER-positive) or progesterone receptor-positive (PR-positive). It works by blocking the effects of estrogen on breast tissue, thereby inhibiting the growth of estrogen-dependent cancer cells.

Breast Cancer Risk Reduction: Tamoxifen may be prescribed to individuals at high risk of developing breast cancer to reduce their risk. This is known as chemoprevention. High-risk individuals may include those with a strong family history of breast cancer or certain genetic mutations (e.g., BRCA mutations).

Ductal Carcinoma in Situ (DCIS): Tamoxifen is commonly used as adjuvant therapy after surgery for ductal carcinoma in situ (DCIS), a non-invasive form of breast cancer. It helps reduce the risk of DCIS recurrence and the development of invasive breast cancer.

Off-Label Uses: Tamoxifen has been explored for potential use in other conditions such as infertility, gynecomastia (enlargement of breast tissue in males), and bipolar disorder. However, these uses are considered off-label and require further research.

It is important to note that tamoxifen (Nolvadex) should only be taken under the supervision of a qualified healthcare professional. They can provide proper guidance, monitor its effectiveness, and manage any potential side effects. Regular follow-up and monitoring, including mammograms and gynecological examinations, are important during tamoxifen treatment.

 

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