Ulipristal Acetate D3 (Acetyl-D3)

Ulipristal Acetate D3, also known as Acetyl-D3, is a synthetic selective progesterone receptor modulator. It is used as an emergency contraceptive to prevent pregnancy after unprotected intercourse or contraceptive failure. Ulipristal Acetate D3 works by inhibiting ovulation and altering the endometrium, making it less receptive to implantation. Chemically, Ulipristal Acetate D3 is a derivative of 19-norprogesterone and contains a deuterium atom at the third position of the acetyl group. This modification increases the stability of the compound and allows for more accurate analysis in pharmacokinetic studies. Ulipristal Acetate D3 is administered orally as a single 30 mg tablet. It should be taken as soon as possible after unprotected intercourse, but no later than 120 hours (5 days) after. It is not intended for routine use as a contraceptive. Potential side effects of Ulipristal Acetate D3 include headache, nausea, abdominal pain, and menstrual irregularities. It is contraindicated in women with a known or suspected pregnancy, severe hepatic impairment, or hypersensitivity to the drug. Overall, Ulipristal Acetate D3 is an effective emergency contraceptive option with a unique chemical structure that allows for improved accuracy in pharmacokinetic studies.