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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 ]
Dosage is generally 2.5 to 7.5 mg daily over 5 days. A higher dose of up to 12.5 mg per day results in increased follicular growth and a higher number of predicted ovulations, without a detrimental effect on endometrial thickness, and is considered in those who do not respond adequately to a lower dose. [15]
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 ]
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 ...
It is the most widely used fertility drug. [6] Other medications in this class include tamoxifen and raloxifene, although both are not as effective as clomiphene and are thus less widely used for fertility purposes. [7] They are used in ovulation induction by inhibiting the negative feedback of estrogen at the hypothalamus. As the negative ...
Letrozole has a 1,2,4 triazole ring which is important for binding with Fe 2+ in the heme moiety of the aromatase enzyme. Also, the cyano benzyl moiety is significant because it partly imitates the steroid backbone of the natural hormone androstenedione.
Doses were 240 then 80 mg/month and 7.5 mg/month, respectively. [ 26 ] Testosterone levels in the long-term androgen deprivation therapy of men with prostate cancer by different GnRH agonists administered at 3 month intervals (goserelin, triptorelin and leuprorelin).