JOGI, S. R. 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, [S. l.], v. 4, n. 4, p. 1038–1043, 2017. DOI: 10.18203/2320-1770.ijrcog20150402. Disponível em: https://www.ijrcog.org/index.php/ijrcog/article/view/2053. Acesso em: 26 oct. 2025.