Ella (Ulipristal Acetate) Can Be Taken Again Immediately if Needed for Emergency Contraception
Your patient can take another dose of Ella (ulipristal acetate) now, 10 days after her previous dose, if she has had unprotected intercourse and needs emergency contraception. There is no mandatory waiting period between doses of ulipristal acetate for emergency contraception purposes. 1
Evidence Supporting Repeat Dosing
Safety data supports repeated use within the same menstrual cycle. A 2025 systematic review found no serious adverse events with repeated ulipristal acetate use, including studies where women took 30 mg doses 4-6 times per month. 1
Extended repeated use has been studied extensively. Research on ulipristal acetate for uterine fibroids demonstrated safety with up to 8 consecutive 3-month courses of daily 10 mg doses (far exceeding emergency contraception dosing), with no concerning changes in endometrial histology or laboratory parameters. 2
The 30 mg emergency contraception dose remains effective regardless of timing. Studies confirm that a standard 30 mg dose of ulipristal acetate is sufficient to delay ovulation when given at the appropriate time in the cycle, even with repeated use. 3
Critical Timing Consideration for Hormonal Contraception
If your patient plans to start or resume hormonal contraception after this second dose of Ella, she must wait at least 5 days before doing so. 4
Starting progestin-containing contraception (pills, patch, ring, injection, or implant) within 5 days of ulipristal acetate administration can decrease the effectiveness of the emergency contraception by interfering with its ability to delay ovulation. 4, 5
Studies demonstrate that when oral contraceptives are started immediately or within 5 days after ulipristal acetate, there is a higher proportion of ovulations (27-45%) compared to delayed or no hormonal contraception use (3%). 4
During the 5-day waiting period and for 7 days after starting hormonal contraception, she must use barrier methods (condoms) for pregnancy protection. 4
Important Clinical Caveats
Levonorgestrel emergency contraception has no such restriction. If your patient needs emergency contraception and wants to immediately start hormonal contraception, levonorgestrel would be a better choice as it can be taken concurrently with hormonal contraceptives without interaction concerns. 4
Advise pregnancy testing if no withdrawal bleed occurs within 3 weeks after either dose of emergency contraception. 4
The evidence on repeated emergency contraception use is of very low certainty, but the available data does not suggest safety concerns that would preclude repeat dosing when clinically indicated. 1