Jogi, S.R. 2017. To compare the efficacy of Drotaverine hydrochloride and Valethamate bromide in shortening of the first stage of labour. International Journal of Reproduction, Contraception, Obstetrics and Gynecology. 4, 4 (Feb. 2017), 1038–1043. DOI:https://doi.org/10.18203/2320-1770.ijrcog20150402.