Key clinical point: Copper IUD users should be cautioned that concurrent menstrual cup use increases the risk of IUD expulsion.
Major finding: At year 2 of the study, expulsion rates among menstrual cup users and nonusers were 23% and 7%, respectively (P < .001).
Study details: A prospective study of 1,092 women enrolled in a contraceptive efficacy trial, 266 of whom used a menstrual cup.
Disclosures: Dr. Long and two coauthors reported having no financial disclosures, but the remaining three authors reported having numerous potential conflicts of interest.
Long J et al. Obstet Gynecol. May 2020;135:1S. doi: 10.1097/01.AOG.0000662872.89062.83.