Contraceptive Efficacy and Tolerability of Chlormadinone Acetate 2mg/ Ethinylestradiol 0.03mg (Belara®)

Results of a Post-Marketing Surveillance Study

Abstract

Objective: This post-marketing surveillance study aimed to investigate the contraceptive efficacy and tolerability of a combination tablet containing chlormadinone acetate 2mg and ethinylestradiol 0.03mg (Belara®) in daily gynaecological practice. A secondary aim was investigation of the changes in clinical signs of androgenisation.

Design: 21 820 female patients were surveyed during a six-cycle period by 3600 gynaecologists throughout Germany.

Results: Out of 21 820 patients, a total of 19 650 women (90.1%) completed the study. Chlormadinone acetate 2mg/ethinylestradiol 0.03mg had excellent contraceptive efficacy with an adjusted Pearl index of 0.076 (unadjusted Pearl index: 0.344), calculated from 125 634 cycles of exposure. Cycle control was good, with beneficial reductions in intracyclic bleeding (22.9% in cycle 1, 1.6% in cycle 6), amenorrhoea, severe withdrawal bleeding and dysmenorrhoea. At cycle six, only 1.2, 0.4 and 0.5% of all patients complained about spotting, breakthrough bleeding and amenorrhoea, respectively. At baseline, 69.9% of the women showed androgen-related skin disorders. After six cycles of chlormadinone acetate 2mg/ ethinylestradiol 0.03mg, these disorders were improved in 86.5% of patients, including 28.5% who had complete resolution. Correspondingly, greasy or very greasy hair condition decreased from 47.0 to 13.6%. Chlormadinone acetate 2mg/ethinylestradiol 0.03mg was well tolerated; a total of two venous thromboembolic events (VTEs) occurred, and both patients recovered with appropriate treatment. Breast pain (3.6%) and migraine/headache (2.6%) were the most frequently reported adverse events. Conversely, these symptoms disappeared in most women (84.5 and 79.9%) who experienced them prior to chlormadinone acetate 2mg/ethinylestradiol 0.03mg treatment.

Conclusions: These results support the reliable contraceptive efficacy, cycle stability and tolerability reported in previous clinical trials and confirm the marked antiandrogenic properties of chlormadinone acetate 2mg/ethinylestradiol 0.03mg.

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Acknowledgements

This study was conducted and sponsored by Grünenthal GmbH, Germany. The authors would like to thank the gynaecologists and Grünenthal staff who participated in the study.

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Correspondence to Dr G. Schramm.

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Schramm, G., Steffens, D. Contraceptive Efficacy and Tolerability of Chlormadinone Acetate 2mg/ Ethinylestradiol 0.03mg (Belara®). Clin. Drug Investig. 22, 221–231 (2002). https://doi.org/10.2165/00044011-200222040-00002

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Keywords

  • Ethinylestradiol
  • Breast Pain
  • Dienogest
  • Contraceptive Efficacy
  • Breakthrough Bleeding