Sinhasane, Hema, and Nishty GM. “A Comparative Study on the Efficacy of Drotaverine and Valethamate on Cervical Dilatation During Labour”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology 6, no. 2 (January 31, 2017): 423–426. Accessed December 4, 2025. https://www.ijrcog.org/index.php/ijrcog/article/view/1128.