Side effects from relugolix combination therapy (Myfembree) in premenopausal women treated for uterine fibroids and endometriosis are minimal, according to research presented at the American Society for Reproductive Medicine's 2021 meeting.
The Food and Drug Administration approved relugolix, a daily oral gonadotropin-releasing hormone antagonist medication, earlier this year to treat heavy menstrual bleeding associated with uterine fibroids. It has not received Food and Drug Administration approval to treat endometriosis yet.
"It was a good kind of vindication about the safety of relugolix combination therapy," Ayman Al-Hendy, MD, PhD, gynecologist and endoscopic surgeon at the University of Chicago, said in an interview.
Researchers led by Al-Hendy analyzed the results from two 24-week clinical trials that examined the effects of relugolix on premenopausal women between the ages of 18 and 50 suffering from uterine fibroids and endometriosis, both of which found that the treatment was well tolerated. With 1,344 patients in total, researchers found that the most common side effects of the treatment were headache, which occurred in 24.3% of participants, and hot flush, which affected 10.6%.
However, the prevalence of adverse reactions was similar to that of the placebo group in which 21.4% of participants experienced headaches and 6.4% experienced hot flushes, which, according to Al-Hendy, means that there is "really no increased risk" of experiencing an adverse event while taking relugolix.
