2D 3D
	ID	DDInter1897
	Drug Type	small molecule
	Molecular Formula	C28H35NO3
	Molecular Weight	433.592
	CAS Number	159811-51-5
	Description	Ulipristal is a selective progesterone receptor modulator used for the purposes of emergency contraception (Ella) and for the treatment of uterine fibroids (Fibristal). It is a derivative of 19-norprogesterone and has both antagonistic and partial agonist activity at the progesterone receptor. It also binds to glucocorticoid receptor, however compared to mifepristone (a progesterone receptor antagonist), ulipristal is more tolerable and has lower glucocorticoid activity and better binding affinity. Ulipristal is currently recommended as first line therapy for emergency contraception, due to improved efficacy and similar side effect profile as compared to the traditional use of levonorgestrel or the Yuzpe regimen. The exact mechanism of action for ulipristal is still currently debated, though there is evidence that it functions by inhibiting ovulation. A recent systematic review proclaimed that the majority of available evidence demonstrates an inhibitory effect on ovulation rather than a post-fertilization effect on the endometrium, which has been heavily debated due to ethical concerns related to abortion (Rosato et al, 2016). Nevertheless, current and ongoing research into the agent's mechanism of action as an emergency contraceptive continue to provide potentially plausible evidence that ulipristal may, in fact, elicit activity on the endometrium that prevents embryo implantation [A175372, A175375, A175378].
	ATC Classification	G03AD02 G03XB02
IUPAC Name	(10S,11S,14R,15S,17R)-14-acetyl-17-[4-(dimethylamino)phenyl]-14-hydroxy-15-methyltetracyclo[8.7.0.0^{2,7}.0^{11,15}]heptadeca-1,6-dien-5-one
InChI	HKDLNTKNLJPAIY-WKWWZUSTSA-N
Canonical SMILES	CN(C)C1=CC=C(C=C1)[C@H]1C[C@@]2(C)[C@@H](CC[C@]2(O)C(C)=O)[C@@H]2CCC3=CC(=O)CCC3=C12
Useful Links	DrugBank ChEBI PubChem Substance KEGG Drug ChemSpider Wikipedia ChEMBL ZINC