Relugolix combination treatment is associated with fewer side effects than relugolix monotherapy
Compared with relugolix combination therapy, women treated with relugolix monotherapy for 12 weeks followed by 12 weeks of relugolix combination therapy lost more bone density as measured by dual-energy X-ray absorptiometry and reported more vasomotor symptoms. This is an expected finding because GnRH antagonist monotherapy is known to significantly reduce ovarian estradiol and progesterone levels, causing bone loss and vasomotor symptoms. Relugolix combination treatment minimizes bone density loss and vasomotor symptoms because the combination of estradiol and norethindrone helps to preserve bone density and reduce hot flashes. Based on these and other findings, the FDA approved relugolix combination therapy for up to 24 months of treatment.1
Contraindications
Contraindications to relugolix combination therapy include: 1) pregnancy, 2) undiagnosed abnormal uterine bleeding, 3) current or personal history of breast cancer or other hormone-sensitive cancer, 4) known osteoporosis, 5) liver disease, 6) high risk of thrombosis, and 7) hypersensitivity to components of the medication.1
Adverse reactions
Serious adverse reactions were reported by 3.1% and 2.3% of women treated with the relugolix combination and placebo, respectively. Women taking relugolix combination reported the following adverse effects: 10.6% hot flashes, 6.3% AUB, 3.5% alopecia, and 3.1% decreased libido. Women taking placebo reported the following adverse effects: 6.6% hot flashes, 1.2% AUB, 0.8% alopecia, and 0.4% decreased libido. Among women taking relugolix combination, the following events occurred, each reported once by different women: myoma expulsion with menorrhagia, myoma prolapse without menorrhagia, cholecystitis, and pelvic pain.1
Bone loss
In women taking relugolix combination or placebo for 6 months, lumbar spine bone density change from baseline, as measured by DEXA, were -0.23% and +0.18%, respectively.1 After 12 months of relugolix combination treatment, lumbar spine bone density had decreased by -0.8% from baseline. These changes in lumbar bone density are minimal, and in my opinion of no clinical importance.
Reported mental health effects
Compared with placebo, more women taking relugolix combination reported depression, depressed mood, or mood swings (2.4% vs 0.8%), irritability (2.4% vs 0%), and anxiety (1.2% vs 0.8%).1
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