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Female fertility agents are medications that improve female’s ability to conceive pregnancy. These agents are prescribed for infertile female who fails to conceive pregnancy after 1-year of regular and unprotected sexual intercourse. [1] The following will cover the advancements of female fertility agents, major causes of female infertility.
Letrozole, sold under the brand name Femara among others, is an aromatase inhibitor medication that is used in the treatment of breast cancer for post-menopausal women. [ 1 ] It was patented in 1986 and approved for medical use in 1996. [ 4 ]
Aromatase inhibitors are a common fertility treatment to treat women with PCOS. A meta-analysis analyzing live birth rates for women with PCOS treated with clomiphene compared to letrozole found that letrozole resulted in higher live birth rates. [11] However, ovulation induction remains an off-label indication, which affects use.
Ovarian stimulation with the aromatase inhibitor letrozole has been proposed for ovulation induction in order to treat unexplained female infertility. In a multi-center study funded by the National Institute of Child Health and Development, ovarian stimulation with letrozole resulted in a significantly lower frequency of multiple gestation (i.e., twins or triplets) but also a lower frequency ...
Founded in 1974 by Barry Sherman, the company is the largest producer of generic drugs in Canada, with annual sales exceeding CA$2.5 billion. [5] By 2023, Apotex employed close to 8,000 people as Canada's largest drug manufacturer, with over 300 products selling in over 115 countries.
Letrozole is an aromatase inhibitor which reduces estradiol levels and increases levels of FSH and LH which can stimulate ovarian follicle maturation and ovulation. Letrozole is the preferred treatment in those with infertility due to PCOS and is associated with a higher pregnancy rate than other treatments. [2]
A general letrozole pharmacophore model. Interaction between letrozole and amino acids in the binding site on the aromatase enzyme. 1,2,4 triazole ring binds to heme moiety. The cyano benzyl moiety is significant because it acts as carbonyl group of endogenous androstenedione.
Letrozole is an aromatase inhibitor that prevents estrogen synthesis and encourages ovulation. Recent studies suggest the use of letrozole before misoprostol or mifepristone for initiation of medical abortion can enhance treatment efficacy and reduce the need for surgical interventions.