Abstract
Of the infertile couples unable to conceive without any identifiable cause, 30% are defined as having unexplained infertility. Management depends on duration of infertility and age of female partner. The treatment of unexplained infertility is empirical, and many different regimens have been used. Among these are expectant management, ovarian stimulation with clomiphene citrate, gonadotropins and aromatase inhibitors, fallopian tube sperm perfusion, tubal flushing, intrauterine insemination, gamete intrafallopian transfer, and IVF. The first approach to treatment of unexplained infertility generally is the use of drugs that stimulate oocyte production. For over four decades, the first-line treatment for ovarian stimulation in unexplained infertility has been clomiphene citrate. Multiple reports suggest that aromatase inhibitors may be effective alternative agents for ovarian stimulation in couples with unexplained infertility. Their administration is reported to be associated with monofollicular development in most cases, which may result in enhanced fertility and a reduced risk of ovarian hyperstimulation and multiple births, as compared to current standard therapies such as gonadotropin and clomiphene. Despite world evidence to the contrary, letrozole has been banned for use for infertility management in India since 2011.
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