BACKGROUND: Increasing the efficacy of treatment of patients with chronic prostatitis / chronic pelvic pain syndrome remains an urgent problem of modern urology.
 AIM: The aim of the study is to evaluate the clinical efficacy of rectal suppositories with oxidized dextran in the treatment of patients with chronic prostatitis / chronic pelvic pain syndrome.
 MATERIALS AND METHODS: 52 patients with chronic prostatitis / chronic pelvic pain syndrome were treated (mean age 33.1 1.7 years). The patients were divided into 2 groups. Patients of the 1st group (n = 25) received oxidized dextran in the form of rectal suppositories for 50 days according to the following scheme: for the first 10 days, 1 rectal suppository at night, daily; the next 40 days 1 rectal suppository every other day. A total of 30 rectal suppositories per course. Patients of the 2nd group (n = 27) received a placebo in the form of rectal suppositories according to the same scheme. Treatment efficacy was assessed on the basis of the original IPPS-MS Genitourinary Disease Assessment questionnaire, the NIH-CPSI and IIEF-5 questionnaires, as well as the results of microscopic examination of prostate secretions.
 RESULTS: In patients of the 1st group a significant clinical improvement was revealed by the end of treatment. According to the IPPS-MS questionnaire there was a decrease in the severity of dysuria by 67%, pain syndrome by 80%, psychosomatic disorders by 47.6%. There was a decrease in the total score of the NIH-CPSI questionnaire by 66.2% (from 25.4 2.4 to 8.6 2.1 points, p 0.05) and an increase in the total score of the IIEF-5 questionnaire by 79.3 % (from 11.6 1.8 to 20.8 2.1 points, p 0.05). Positive changes in the clinical parameters of patients of the 1st group were accompanied by an improvement in the results of microscopy of the secretion of the prostate a decrease in the number of leukocytes and an increase in the number of lecithin grains. There were no significant changes in any of the studied parameters in patients of the 2nd group. None of the patients in both groups had side effects from the therapy.
 CONCLUSIONS: Oxidized dextran in the form of rectal suppositories has a pronounced anti-inflammatory activity and significantly reduces the severity of dysuria, pain and psychosomatic disorders in patients with chronic prostatitis / chronic pelvic pain syndrome. The results of the study indicate the promise of using oxidized dextran in the form of rectal suppositories for the treatment of patients with chronic prostatitis / chronic pelvic pain syndrome.