title: Multi-centre open study of a triphasic levonorgestrel-ethinyloestradiol combined oral contraceptive ('Trinordiol').
abstract: A long-term, multi-centre open study was carried out to evaluate the efficacy, cycle control and side-effects with a triphasic, combined oral contraceptive containing levonorgestrel and ethinyloestradiol ('Trinordiol'). A total of 2517 women completing at least 1 cycle of treatment was followed up at 2 to 3-monthly intervals; the overall number of cycles on treatment was 37,090. During treatment, only 2 pregnancies occurred which were attributable to pill failure. Cycle control was good: cycle irregularities were 9.6% overall, but were most common (19.6%) during the first 3 cycles. Only 3.8% of patients withdrew from the study for this reason. Side-effects were those commonly seen with oral contraceptives, and they produced a drop-out rate of only 13.9%. There were no clinically significant effects on blood pressure or body weight. The results also suggested that 'Trinordiol' has a beneficial effect on pre-existing acne.
mesh_terms: D000152:Acne Vulgaris / Q000188:drug therapy; D000293:Adolescent; D000328:Adult; D001794:Blood Pressure / Q000187:drug effects; D001835:Body Weight / Q000187:drug effects; D003277:Contraceptives, Oral, Combined / Q000009:adverse effects; D003279:Contraceptives, Oral, Sequential / Q000009:adverse effects; D004997:Ethinyl Estradiol / Q000008:administration & dosage / Q000009:adverse effects / Q000494:pharmacology*; D019304:Ethinyl Estradiol-Norgestrel Combination; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008597:Menstrual Cycle / Q000187:drug effects; D009644:Norgestrel / Q000008:administration & dosage / Q000009:adverse effects / Q000494:pharmacology*
chemical_list: D003277:Contraceptives, Oral, Combined; D003279:Contraceptives, Oral, Sequential; D009644:Norgestrel; D004997:Ethinyl Estradiol; D019304:Ethinyl Estradiol-Norgestrel Combination