The study aimed to research an effciency and safety of isotretinoin usage in small doses in patients with recurrent acne of moderate severity. Materials and methods 40 patients (18 – 27 years) with acne were examined (25 women). All of the patients have had different therapy earlier. To estimate the severity and prevalence of the disease Acne Dermatology Index (ADI) was used. All the patients were ordered isotretinoin (Roaccutane) at a standard dose of 10 mg per day for 3 months. Concentrations of triglycerides, cholesterin, ALT and AST in blood serum have been researched before and during the isotretinoin therapy. After 3-months isotretinoin monotherapy there was a prospective 6-months observation. There have been 40 healthy people examined in a control group. Results. After 3 months of isotretinoin therapy comedones, papules, pustules disappeared in most of the patients, ADI ran to 0,6±0,01 (р<0,001). Isotretinoin in the whole is tolerable, side effects were minimal. By the end of a 3-months therapy laboratory ranges (AST, ALT, triglycerides, etc.) have become comparable with control parameters. Conclusion. Small doses of isotretinoin can quickly solve the problem of an eruption in patients with acne of moderate severity, prevent a recurrence, minimize side effects risk.