Vaginal bleeding patterns in women using once-a-month injectable contraceptives

Area of Science:

• Reproductive Health
• Contraception
• Gynecology

Background:

• Long-acting injectable contraceptives are needed for predictable vaginal bleeding patterns.
• Some women find amenorrhea or irregular bleeding with progestogen-only methods unacceptable.
• Combined estrogen-progestogen injectables aim for more regular bleeding than progestogen-only options.

Purpose of the Study:

• To evaluate the vaginal bleeding patterns of once-a-month injectable contraceptives.
• To compare bleeding patterns with other long-acting contraceptive methods.
• To assess discontinuation rates due to menstrual disturbances.

Main Methods:

• Analysis of World Health Organization (WHO) studies on once-a-month injectables (Cyclofem, Mesigyna).
• Comparison of bleeding patterns (irregular, prolonged) with untreated women and DMPA users.
• Life table analysis of 12-month discontinuation rates for menstrual reasons.

Main Results:

• Once-a-month injectables (Cyclofem, Mesigyna) show improved bleeding regularity compared to DMPA.
• Users experienced irregular bleeding (23.5-25.2%) and prolonged bleeding (11.1-13.3%) more than untreated women.
• Discontinuation rates for menstrual disturbances were lower than expected for Cyclofem and Mesigyna compared to progestogen-only methods.

Conclusions:

• Once-a-month injectable contraceptives provide bleeding patterns closer to normal than other injectables.
• Significant deviations from normal menstrual patterns still occur, leading to some discontinuations.
• Comprehensive counseling on potential menstrual changes is essential for users of these contraceptives.