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A multicenter comparative trial of triphasic and monophasic, low-dose combined oral contraceptives.

Author(s): Dunson TR, McLaurin VL, Aguayo EL, de Silva P, Calventi V, Gerais AS, Serani RG

Affiliation(s): Family Health International, Research Triangle Park, NC.

Publication date & source: 1993-06, Contraception., 47(6):515-25.

Publication type: Clinical Trial; Multicenter Study; Randomized Controlled Trial

A comparative multicenter clinical trial of two combined oral contraceptives (OCs) was conducted at clinics located in the Sudan, Sri Lanka, Chile, the Dominican Republic and Ecuador. The trial was designed to determine if there were differences in efficacy, safety and acceptability between a triphasic and a low-dose monophasic OC. This report includes analysis of 1088 women. At each center, subjects were randomly allocated to one of the two OCs. Follow-up visits were scheduled at 1, 4, 8 and 12 months after admission. There were two accidental pregnancies attributed to user failure reported during the study period; one in the triphasic group and one in the monophasic group. Adverse experiences were mainly minor with headaches and dizziness being the most common complaints; frequency of reports was similar in both groups. Cycle control was good in both groups with women in the triphasic group reporting fewer complaints of intermenstrual bleeding. Both OCs were safe and effective.

Page last updated: 2006-01-31

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