title: Synphasic tablets in Canadian practice: a phase-IV multicenter study.
abstract: The performance of a low-dose triphasic oral contraceptive (OC) in the first four cycles of use was evaluated by 1,326 primary-care physicians and specialists across Canada in a phase-IV postmarketing trial. Data were available from 5,460 women who completed 19,756 cycles of use with Synphasic. The incidence of intermenstrual bleeding characteristically decreased over the four cycles to 10% in women who were first-time users of OCs, to 14% in women who had previously used OCs but had discontinued use until this trial, and to 16% in women who had switched from another OC to Synphasic. The women reported a low incidence of headache, nausea, weight gain, breast complaints, and acne while receiving Synphasic. The results demonstrate good endometrial control with Synphasic and a high level of patient acceptance.
authors.affiliation: Department of Family and Community Medicine, Women's College Hospital, Toronto, Ontario, Canada.
authors.forename: M G
authors.initials: MG
authors.lastname: Powell
authors.forename: C
authors.initials: C
authors.lastname: Talbot
mesh_terms: D000293:Adolescent; D000328:Adult; D003277:Contraceptives, Oral, Combined / Q000009:adverse effects / Q000627:therapeutic use; D004338:Drug Combinations; D004997:Ethinyl Estradiol / Q000009:adverse effects / Q000627:therapeutic use*; D005260:Female; D006801:Humans; D008597:Menstrual Cycle / Q000502:physiology; D009640:Norethindrone / Q000009:adverse effects / Q000627:therapeutic use*; D013997:Time Factors
chemical_list: D003277:Contraceptives, Oral, Combined; D004338:Drug Combinations; C020416:norethindrone acetate, ethinyl estradiol, ferrous fumarate drug combination; D004997:Ethinyl Estradiol; D009640:Norethindrone