BACKGROUND To evaluate the efficacy of dinoprostone vaginal pessary for cervical ripening and labour induction in term pregnant women. METHODS This was a prospective observational study conducted at Sri Ramachandra Institute of Higher Education and Research from September 2016 to September 2018. The study included pregnant women with singleton pregnancy and gestational age (GA) between 37 weeks and 41 weeks of gestation. The estimated sample size was 100. All 100 women were induced with dinoprostone vaginal pessary. RESULTS The average induction to active phase interval was 10 hours 58 minutes. About 60.3 % of primigravida had an active phase time interval of 12 hours 03 minutes; and 95.2 % of primigravida delivered < 24 hours with a mean induction to delivery time interval of 17 hours 36 minutes. 4 % of primigravida had failed induction. About 84.8 % of multigravida delivered with mean induction to active phase time interval of 08 hours 57 minutes and 100 % of multigravida delivered < 24 hours with a mean induction to delivery time interval of 12 hours 19 minutes. Out of 100 patients, 80 % of patients delivered by spontaneous vaginal delivery with episiotomy, 5 % of patients delivered by assisted vaginal delivery with episiotomy and 15 % of patients delivered by Caesarean section. Almost 97 % of multiparous women delivered vaginally. No adverse maternal and neonatal outcome was noted in the present study. CONCLUSIONS Dinoprostone vaginal pessary is highly effective in the induction of labour at term in properly selected cases. In terms of success and failure, dinoprostone vaginal pessary does not differ much from dinoprostone gel. KEY WORDS Labour Induction, Propess, Dinoprostone

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