Myovant Sciences and Pfizer Inc. announced that the US Food and Drug Administration (FDA) has approved Myfembree (relugolix 40 mg, estradiol 1 mg, and norethindrone acetate 0.5 mg) as a one-pill, once-a-day therapy for the management of moderate to severe pain associated with endometriosis in pre-menopausal women, with a treatment duration of up to 24 months. The approval is supported by one-year efficacy and safety data, including 24-week data from the phase 3 SPIRIT 1 and SPIRIT 2 trials, which were published in The Lancet, and the first 28 weeks of an open-label extension study for eligible women who completed either SPIRIT 1 or SPIRIT 2. Myfembree also is approved for heavy menstrual bleeding associated with uterine fibroids in pre-menopausal women. Myovant and Pfizer will continue to jointly commercialize Myfembree in the US and product is available immediately.
