Ulipristal Acetate
/yoo-li-PRIS-tal AS-eh-tate/
A selective progesterone receptor modulator (SPRM) used in emergency contraception that remains effective for up to 5 days after unprotected sex.
Detailed Explanation
Ulipristal acetate (brand name: Mifestad, ella) is a more recently developed emergency contraceptive that works differently from levonorgestrel. It can delay ovulation even when the hormonal process has already started, making it effective for a longer window—up to 120 hours (5 days) after unprotected sex. At the 72-hour mark, it maintains about 95% effectiveness compared to 58% for levonorgestrel. It requires a prescription in most countries.
Related Terms
Frequently Asked Questions
What is Ulipristal Acetate?
A selective progesterone receptor modulator (SPRM) used in emergency contraception that remains effective for up to 5 days after unprotected sex.
How does Ulipristal Acetate work?
Ulipristal acetate (brand name: Mifestad, ella) is a more recently developed emergency contraceptive that works differently from levonorgestrel. It can delay ovulation even when the hormonal process has already started, making it effective for a longer window—up to 120 hours (5 days) after unprotected sex.
Need Help?
If you need emergency contraception, we can help.