Ulipristal acetate (all doses) leads to lower observed number of pregnancies (all women) compared with levonorgestrel (high certainty).
The review found no eligible studies for this question.
Ulipristal acetate (all doses) showed no clear difference in specific side effects ‐ nausea compared with levonorgestrel (moderate certainty).
Ulipristal acetate (all doses) showed no clear difference in specific side effects ‐ vomiting compared with levonorgestrel (moderate certainty).
Ulipristal acetate (all doses) showed no clear difference in specific side effects ‐ spotting/bleeding after treatment compared with levonorgestrel (moderate certainty).
Ulipristal acetate (all doses) probably leads to lower menses ‐ early compared with levonorgestrel (moderate certainty).
Ulipristal acetate (all doses) leads to higher menses ‐ delay compared with levonorgestrel (high certainty).