title: Serum estrogens and ovulation return in chronic users of a once-a-month injectable contraceptive.
abstract: To determine whether the long-term exposure to a monthly injectable contraceptive, containing dihydroxyprogesterone acetophenide 150 mg and estradiol enanthate 10 mg, induces significant changes on the serum estrogens profile and ovulation return in women, a study in chronic users was undertaken. Ovarian function was assessed for 3 months following a single injection of the contraceptive agent in a group of women (n = 7) who have been on this formulation for an average period of 6.7 years and in a non-user control group (n = 7). The serum concentrations of 17 beta-estradiol, estrone and progesterone were measured in samples drawn at regular intervals throughout the entire study. The endometrial bleeding pattern was recorded in all subjects. The results indicated that the post-injection serum estradiol maximum levels (exogenous peak) occurred significantly earlier (p less than 0.05) in chronic users as compared with the non-user control group. Baseline serum estrone concentrations were slightly higher in chronic users than those observed in the control group, while the values of serum 17 beta-estradiol did not exhibit significant differences among the two groups. Ovulation was documented within 60-90 days after injection in all subjects from both groups. A similar length of the first bleeding-free period was observed in all participants. The overall data provide evidence of a moderate increase of estrone, one of the still active metabolic conversion products of 17 beta-estradiol, in the sera of chronic users of this combined contraceptive without affecting its pharmacodynamics.
authors.affiliation: Family Planning Service, General Hospital of Mexico, Mexico City.
authors.forename: R
authors.initials: R
authors.lastname: Schiavon
authors.forename: S
authors.initials: S
authors.lastname: Benavides
authors.forename: G
authors.initials: G
authors.lastname: Oropeza
authors.forename: J
authors.initials: J
authors.lastname: Garza-Flores
authors.forename: R
authors.initials: R
authors.lastname: Recio
authors.forename: V
authors.initials: V
authors.lastname: Díaz-Sanchez
authors.forename: G
authors.initials: G
authors.lastname: Pérez-Palacios
mesh_terms: D000328:Adult; D000463:Algestone Acetophenide / Q000008:administration & dosage*; D003271:Contraceptive Agents, Female / Q000008:administration & dosage*; D004958:Estradiol / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000097:blood; D004967:Estrogens / Q000097:blood*; D004970:Estrone / Q000097:blood; D005260:Female; D006801:Humans; D010060:Ovulation
chemical_list: D003271:Contraceptive Agents, Female; D004967:Estrogens; D004970:Estrone; D004958:Estradiol; D000463:Algestone Acetophenide; C002027:estradiol enanthate