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Related Experiment Videos

Continuous oral contraceptives: are bleeding patterns dependent on the hormones given?

Alison B Edelman1, Stephanie L Koontz, Mark D Nichols

  • 1Department of Obstetrics and Gynecology, Oregon Health & Science University, Portland, Oregon 97239, USA. edelmana@ohsu.edu

Obstetrics and Gynecology
|March 2, 2006
PubMed
Summary

Continuous combined oral contraceptives with norethindrone acetate showed more amenorrhea and less spotting than levonorgestrel formulations. Higher estrogen doses did not improve bleeding patterns or satisfaction.

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Area of Science:

  • Reproductive Endocrinology
  • Contraception Research

Background:

  • Combined oral contraceptives (COCs) are widely used for contraception.
  • Continuous dosing regimens aim to minimize or eliminate menstrual bleeding.
  • Understanding the influence of progestin type and estrogen dose on bleeding patterns is crucial for optimizing COC use.

Purpose of the Study:

  • To evaluate the impact of different progestin types (levonorgestrel vs. norethindrone acetate) and ethinyl estradiol doses (20 mcg vs. 30 mcg) on bleeding patterns, adverse effects, and user satisfaction during continuous COC administration.

Main Methods:

  • A randomized, double-blind, 4-arm study involving 139 women over 180 days.
  • Participants received continuous COCs with varying combinations of levonorgestrel/ethinyl estradiol or norethindrone acetate/ethinyl estradiol.

Related Experiment Videos

  • Bleeding events, adverse effects, and satisfaction with bleeding patterns were systematically recorded.

    • Main Results:

    • Norethindrone acetate formulations (20NETA and 30NETA) resulted in significantly more amenorrhea days compared to levonorgestrel/ethinyl estradiol (30LNG) in the second 90 days.
    • The 30LNG group experienced more spotting days than both norethindrone acetate groups.
    • No significant differences in adverse effects were observed between the groups.
    • Women using 30LNG reported lower satisfaction with bleeding patterns.

    Conclusions:

    • Increasing ethinyl estradiol dose from 20 mcg to 30 mcg did not improve bleeding patterns with either levonorgestrel or norethindrone acetate.
    • Continuous oral contraceptives containing 1,000 mcg norethindrone acetate provided more amenorrhea and less spotting than those with 100 mcg levonorgestrel.
    • Progestin type, specifically norethindrone acetate, appears more influential than estrogen dose in achieving predictable bleeding patterns with continuous COCs.