Displaying 5 results of Ulipristal Stable Isotopes Ulipristal is a medication used for emergency contraception and the treatment of uterine fibroids. Ulipristal stable isotopes are isotopically labeled forms of ulipristal used in research and drug development. These isotopes have identical chemical and physical properties as non-labeled ulipristal, but they have a unique atomic composition that allows scientists to track the movement and metabolism of the drug in biological systems. Ulipristal stable isotopes are essential tools for drug development and pharmacokinetic studies.