Bleeding and Cramping in the First 90 Days After Copper or Levonorgestrel Intrauterine Device Placement.

INTRODUCTION: We describe bleeding and cramping patterns during the first 90 days after intrauterine device (IUD) placement. METHODS: This was a planned sub-analysis of a prospective cohort study of IUD users in the United States who initiated the copper T380A (Cu-IUD) or the levonorgestrel 52 mg intrauterine device (LNG IUD) at any time in the menstrual cycle. Participants rated bleeding and cramping from 1 (no bleeding or cramping) to 4 (heavy bleeding or severe cramping). We included participants providing ≥ 60 days of continuous responses and described overall bleeding/cramping. RESULTS: Of 230 participants enrolled, 137 (60%) met inclusion criteria (Cu-IUD n = 69, 50% and LNG IUD n = 68, 50%). Cu-IUD users reported fewer days with any bleeding (26 days, IQR 18-31) compared with LNG IUD users (38 days, IQR 27-55, p < 0.001). LNG IUD users reported more spotting days (median 31 [IQR 17-41] vs. 13 [IQR 10-20], p < 0.01). Total bleeding/spotting days were similar for each IUD type regardless of placement timing or prior contraceptive method. Median reported cramping days were similar for both IUDs (Cu-IUD 18, IQR 7-29 and LNG IUD 18, IQR 10-38, p = 0.18). Cramping was most common in the week following placement for both IUD types, decreased over the 90-day period, and did not vary by IUD type. CONCLUSION: LNG IUD users reported more days with any bleeding in the first 90 days after placement overall compared with Cu-IUD users, largely driven by more than twice the number of spotting days. Cramping was most common in the first week following IUD placement and decreased over time. TRIAL REGISTRATION: Clinicaltrials.Gov Identifier: NCT01730911.