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Mifeprex: profile and news
Teva's generic Zofran gets provisional FDA approval Feb 27, 2006 Teva Generic Zofran Unlikely To Hurt GSK Feb 27, 2006 SCOLR Pharma Reports Positive Ondansetron Clinical Results, New ... Feb 16, 2006 Scolr's ondansetron tablets found to outperform Glaxo rival Feb 17, 2006 Par Pharmaceutical Reports Sales and Earnings for 2005 Feb 28, 2006 Jagged little pills Mar 2, 2006 GSK says profits could fall prey to generic rivals Feb 8, 2006 Teva Announces Tentative Approval of Ondansetron Injection USP Feb 27, 2006 Nausea and Vomiting Significant Among Very Young Pediatric ... Feb 17, 2006 FDA approves generic competitor to Glaxo's Flonase Feb 22, 2006 FDA OKs Teva chemotherapy side effects treatment Feb 26, 2006 GSK annual results top forecast; beats hopes on 2006 guidance ... Feb 8, 2006 Generic Products Compete With GlaxoSmithKline Feb 9, 2006 Glaxo's CEO: Not ready to quit in '07 Feb 9, 2006 GSK says profits could fall prey to generic rivals Feb 8, 2006 Doctors get the point Jan 31, 2006 Hana Posts Positive Study Results Jan 9, 2006 Merck Gets FDA OK for Widened Use of Emend Jan 11, 2006 Emend® Approved for Prevention of Moderate Chemotherapy ... Jan 12, 2006 Hana Biosciences Announces Positive Results of Initial ... Jan 9, 2006 Genzyme Names New Head of Product Development for Campath and ... Jan 13, 2006 FLAVORx Enhances Treatment Options for Pediatric Oncology Patients Jan 19, 2006 Hana Biosciences Announces 2006 Corporate Goals; Key 2005 ... Jan 7, 2006 Other information Indication For induced abortion Pharmacology Mifepristone is a synthetic steroid with antiprogestational effects indicated for the medical termination of intrauterine pregnancy through 49 days' pregnancy. Doses of 1 mg/kg or greater of mifepristone have been shown to antagonize the endometrial and myometrial effects of progesterone in women. During pregnancy, the compound sensitizes the myometrium to the contraction-inducing activity of prostaglandins. Mifepristone also exhibits antiglucocorticoid and weak antiandrogenic activity. The activity of the glucocorticoid dexamethasone in rats was inhibited following doses of 10 to 25 mg/kg of mifepristone. Doses of 4.5 mg/kg or greater in human beings resulted in a compensatory elevation of adrenocorticotropic hormone (ACTH) and cortisol. Mechanism Of Action The anti-progestational activity of mifepristone results from competitive interaction with progesterone at progesterone-receptor sites. Based on studies with various oral doses in several animal species (mouse, rat, rabbit and monkey), the compound inhibits the activity of endogenous or exogenous progesterone. The termination of pregnancy results. Drug Category Menstruation-Inducing Agents; Luteolytic Agents; Contraceptives, Oral, Synthetic; Contraceptives, Postcoital, Synthetic; Hormone Antagonists; Abortifacient Agents, Steroidal ATC:G03XB01 Brand Names/Synonyms HSDB 6841; Mifegyne; Mifeprex; Mifepriston; Mifepristona [Spanish]; Mifepristone; Mifepristone [Usan:Ban:Inn]; Mifepristonum [Latin]; RU 486; RU-486; RU-486, MIFEPRISTONE Dosage Forms Tablet Absorption The absolute bioavailability of a 20 mg oral dose is 69% Interactions Interactions for Mifepristone: Although specific drug or food interactions with mifepristone have not been studied, on the basis of this drugís metabolism by CYP 3A4, it is possible that ketoconazole, itraconazole, erythromycin, and grapefruit juice may inhibit its metabolism (increasing serum levels of mifepristone). Furthermore, rifampin, dexamethasone, St. Johnís Wort, and certain anticonvulsants (phenytoin, phenobarbital, carbamazepine) may induce mifepristone metabolism (lowering serum levels of mifepristone). Based on in vitro inhibition information, coadministration of mifepristone may lead to an increase in serum levels of drugs that are CYP 3A4 substrates. Due to the slow elimination of mifepristone from the body, such interaction may be observed for a prolonged period after its administration. Therefore, caution should be exercised when mifepristone is administered with drugs that are CYP 3A4 substrates and have narrow therapeutic range, including some agents used during general anesthesia. Chemical IUPAC Name 11-(4-dimethylaminophenyl)-17-hydroxy-13-methyl-17-prop-1-ynyl-1,2,6,7,8,11,12,13,14,15,16,17-dodecahydrocyclopenta[a]phenanthren-3-one Chemical Formula C29H35NO2 Half Life 18 hours Drug Type Approved Drug # Accession No APRD00432 CAS Registry Number 84371-65-3 |
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