Objective. To investigate the effectiveness of Mastodynon in women with benign breast diseases, which are accompanied by mastalgia after endoprosthetics of mammary glands for cosmetic purposes. Subjects and methods. The effectiveness of therapy with the herbal preparation Mastodynon was evaluated in 42 women with symptoms of mastalgia after augmentation mammoplasty. The patients used the drug as cycles of 1 tablet twice daily over a 3-month period at a 2.5–3 month interval. To analyze the results, the patients were divided into 3 groups. The study was conducted for 1 year through comprehensive survey with a questionnaire every 6 months. Results. After 6 months of Mastodynon intake, the questionnaire survey of patients showed varying degrees of positive results in 64.2% of cases. Following 1 year, the survey revealed a stable positive effect in 80.9% of cases. Conclusion. Mastodynon showed a high effectiveness and a good tolerance in treating mastalgia in women after endoprosthetics of mammary glands for cosmetic purposes. The administration of Mastodynon improved quality of life in patients. © Bionika Media Ltd.