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Delayed first injection of the once-a-month injectable contraceptive containing 25 mg of medroxyprogesterone acetate and 5 mg of E2-cypionate: effects on ovarian function

      Abstract

      Objective: To assess whether women who were administered the first injection of DMPA+E2C on day 7 of their menstrual cycle (delayed injection) exhibit the same degree of ovarian suppression as women who receive it on day 5 of their menstrual cycle.
      Design: Multicenter, randomized controlled trial.
      Setting: Reproductive health clinics.
      Patient(s): Women aged between 18 and 38 years (inclusive) willing to use DMPA+E2C as their method of contraception.
      Intervention(s): Participants received a DMPA+E2C injection on day 5 (control group, n = 41) or day 7 (delayed-injection group, n = 117) of their menstrual cycle.
      Main Outcome Measure(s): Ovarian activity and follicular development determined by serial serum progesterone levels and vaginal ultrasound.
      Result(s): Participants who received DMPA+E2C on day 5 of their menstrual cycle (control group) exhibited no more than limited follicular growth (no follicle >16 mm). Of those women who received DMPA+E2C on day 7 of their menstrual cycle (delayed-injection group), 21 (18%) showed some follicular growth, of whom 4 (3%) ovulated.
      Conclusion(s): The first injection of DMPA+E2C given on day 7 of a menstrual cycle does not provide the same inhibition of ovarian activity as that observed when it is administered on day 5 of the menstrual cycle.

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