Femara (Letrozole) is popular among bodybuilders and other athletes. The drug is used in sports as an additional element in the steroid cycle to reduce the levels of estrogen. It should be noted that this drug is also capable to affect testosterone levels by increasing the level of LH (luteinizing hormone) and FSH (follicle-stimulating hormone). For this reason, some doctors use Letrozole in patients with low levels of testosterone.