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Related Experiment Videos

Bleeding patterns with low-dose, monophasic oral contraceptives.

R A Edgren1, J H Nelson, R T Gordon

  • 1Syntex Laboratories, Inc., Palo Alto, California 94303.

Contraception
|September 1, 1989
PubMed
Summary

New low-dose oral contraceptives (OCs) were studied for cycle control over 12 months. Fresh users experienced more intermenstrual bleeding (IMB) initially, while Ng + EE formulations showed fewer IMB episodes compared to NET + EE.

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Area of Science:

  • Reproductive Health
  • Pharmacology
  • Gynecology

Background:

  • Oral contraceptives (OCs) are widely used for cycle control and contraception.
  • Understanding intermenstrual bleeding (IMB) is crucial for OC efficacy and user satisfaction.
  • Low-dose formulations aim to minimize side effects while maintaining cycle control.

Purpose of the Study:

  • To analyze cycle control over 12 months using two low-dose oral contraceptive formulations.
  • To compare intermenstrual bleeding (IMB) patterns between different OC formulations and user groups.
  • To assess the impact of prior OC use on IMB incidence.

Main Methods:

  • A 12-month prospective study analyzing bleeding patterns on pill-taking days 1-21.
  • Two low-dose OCs were used: norethindrone/ethinyl estradiol (NET + EE) and norgestrel/ethinyl estradiol (Ng + EE).

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  • Participants were categorized as 'fresh' (no OCs for ≥2 months) or 'switch-over' (prior OCs with ≥0.05 mg estrogen).

    • Main Results:

    • Fresh OC users reported more IMB than switch-over users, particularly in the first three cycles.
    • IMB incidence decreased over time for both user groups.
    • Ng + EE formulations resulted in fewer IMB episodes during early cycles compared to NET + EE.
    • NET + EE users exhibited a characteristic W-shaped daily IMB incidence curve, most prominent in early cycles.

    Conclusions:

    • Cycle control with low-dose OCs is influenced by formulation and prior user status.
    • The Ng + EE formulation demonstrates potentially better early cycle control regarding IMB.
    • Further research into IMB patterns can optimize OC selection and improve user adherence.