Normophasic preparation containing progestogen desogestrel and ethinylestradiol

Area of Science:

• Reproductive Medicine
• Pharmacology

Background:

• Oral contraceptives are widely used for family planning.
• Normophasic formulations offer a specific dosing regimen.
• Evaluating new contraceptive formulations is crucial for improving user compliance and safety.

Purpose of the Study:

• To assess the efficacy and safety of a novel normophasic oral contraceptive.
• To monitor bleeding patterns, side effects, and user experience.
• To evaluate the impact on liver function and endometrial development.

Main Methods:

• A Finnish multicenter study involving 157 healthy volunteers over 2157 cycles.
• The contraceptive comprised ethinyl estradiol and desogestrel in a normophasic regimen.
• Data collected included bleeding patterns, side effects, liver function tests, and endometrial biopsies.

Main Results:

• No pregnancies were reported during the study period.
• Irregular bleeding decreased from 12% in the first cycle to 4% after one year.
• Common side effects included nausea and headache; 17 women discontinued due to side effects.
• No clinically significant changes in body weight or liver function were observed.
• Endometrial biopsies primarily showed a secretory pattern with mild hypoplasia, with no hyperplastic or malignant changes.

Conclusions:

• The evaluated normophasic oral contraceptive containing ethinyl estradiol and desogestrel is effective in preventing pregnancy.
• The formulation demonstrates an acceptable safety profile with manageable side effects and no adverse effects on liver function or endometrial health.