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intervention course, patients were followed for 4 weeks (phase II, discontinuation period). The collected data were analyzed in SPSS 22, with χ test; Fishers exact test and independent t-test, according to the intention-to-treat principle. Two-factor repeated measure analysis of variance was used to compare score changes over phases. P < 0.05 was considered to be statistically significant. At week 14, reduction in Yale-Brown Obsessive Compulsive Scale scores in ondansetron, granisetron and placebo groups was 41.5%, 39.7% and 15.2%, respectively (P = 0.001). Complete response in the ondansetron group was significantly higher than in the granisetron group ((P = 0.041), risk ratio (95% confidence interval) = 2.33 (1.18-3.045)]. Relapse occurred by three (7.31%) patients in the granisetron group, whereas it was not seen in the ondansetron group [P < 0.001, risk ratio (95% confidence interval) = 2.81 (1.016-4.51)]. The results of this present study confirm the benefit of using ondansetron and granisetron as augme