title: Antipyrine elimination in saliva after low-dose combined or progestogen-only oral contraceptive steroids.
abstract: 1 A 'low-dose' combined oral contraceptive steroid (OCS) preparation containing 30 microgram ethinylo-estradiol and 150 microgram levonorgestrel was found to reduce significantly antipyrine clearance in a group of women acting as their own controls. 2 An OCS preparation containing only a progestogen (75 microgram norgestrel) did not reduce antipyrine clearance in a second group of women. 3 The evidence suggesting that the oestrogen component of combined OCS preparations could be responsible for the reduction in antipyrine clearance is discussed.
mesh_terms: D000293:Adolescent; D000328:Adult; D000983:Antipyrine / Q000378:metabolism*; D003276:Contraceptives, Oral / Q000494:pharmacology*; D003277:Contraceptives, Oral, Combined / Q000494:pharmacology; D003278:Contraceptives, Oral, Hormonal / Q000494:pharmacology*; D004997:Ethinyl Estradiol / Q000494:pharmacology; D005260:Female; D006207:Half-Life; D006801:Humans; D007700:Kinetics; D009644:Norgestrel / Q000494:pharmacology; D012463:Saliva / Q000378:metabolism*
chemical_list: D003276:Contraceptives, Oral; D003277:Contraceptives, Oral, Combined; D003278:Contraceptives, Oral, Hormonal; D009644:Norgestrel; D004997:Ethinyl Estradiol; D000983:Antipyrine