Femara (INN, trade name Femara®) is an oral non-steroidal aromatase inhibitor that has been introduced for the adjuvant treatment of hormonally-responsive breast cancer
Estrogens are produced by the conversion of androgens through the activity of the aromatase enzyme. Femara blocks production of estrogens in this way by competitive, reversible binding to the heme of its cytochrome P450 unit. The action is specific, and letrozole does not reduce production of mineralo- or corticosteroids. In contrast, the antiestrogenic action of tamoxifen, the major medical therapy prior to the arrival of aromatase inhibitors, is due to its interfering with the estrogen receptor, rather than inhibiting estrogen production.
Femara is approved by the United States Food and Drug Administration (FDA) for the treatment of local or metastatic breast cancer that is hormone receptor positive or has an unknown receptor status in postmenopausal women. Side effects include signs and symptoms of hypoestrogenism. There is concern that long term use may lead to osteoporosis, which is why prescriptions of Femara are often accompanied by prescriptions of osteoporosis-fighting medication such as Fosamax.
Femara has shown to reduce estrogen levels by 98 percent while raising testosterone levels. The anti-estrogen action of letrozole is preferred by athletes and bodybuilders for use during a steroid cycle to reduce bloating due to excess water retention and prevent the formation of gynecomastia related breast tissue that is a side effect of some anabolic steroids. Usage above 2.5 mg/day is known to potentially temporarily kill sex drive. Above 5mg/day for extended periods may cause kidney problems.
Femara has also been shown to delay the fusing of the growth plates in adolescents. This may boost the effectiveness of growth hormone, and thus Femara is used to treat adolescents and children with short stature.

Medicinal name:
  • Letrozole 2.5 MG Oral Tablet [Femara]

Femara - Pharmacology:

Femara is a nonsteroidal competitive inhibitor of the aromatase enzyme system; it inhibits the conversion of androgens to estrogens. In adult nontumor- and tumorbearing female animals, letrozole is as effective as ovariectomy in reducing uterine weight, elevating serum Leuteinizing hormone (LH), and causing the regression of estrogen-dependent tumors. In contrast to ovariectomy, treatment with letrozole does not lead to an increase in serum (folicile stimulating hormone (FSH). Femara selectively inhibits gonadal steroidogenesis but has no significant effect on adrenal mineralocorticoid or glucocorticoid synthesis.

Femara mini report

Femara NDA
NDA - A product marketed under an approved New Drug Application
Start - Stop data
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not occurred

Femara Interactions

Clinical interaction studies with cimetidine and warfarin indicated that the coadministration of Femara with these drugs does not result in clinically- significant drug interactions. (See CLINICAL PHARMACOLOGY)

Coadministration of Femara and tamoxifen 20 mg daily resulted in a reduction of letrozole plasma levels by 38% on average. There is no clinical experience to date on the use of Femara in combination with other anticancer agents.

Drug/Laboratory Test-Interactions

None observed.

Femara Contraindications

Femara® (letrozole tablets) is contraindicated in patients with known hypersensitivity to Femara or any of its excipients.

Manufacturers name:

  • Novartis Pharmaceuticals Corporation
  • Physicians Total Care, Inc

Femara tags categories:

Generic name, Overdose, Half Life Femara, Food Interactions, Chemical, etc..

Femara see also FDA report Saw Palmetto

Womens Health

Chemical structure:
N H N N N N H H H H H H H H H H C17H11N5 2D chemical structure C17H11N5 SVG | 2D structure chemical names, chemical properties, classification C17H11N5