SRIVASTAVA, K.; SINHA, P.; SHARMA, R.; GUPTA, U. A comparative study of the effect of drotaverine hydrochloride with hyoscine butylbromide in first stage of labor. International Journal of Basic & Clinical Pharmacology, [S. l.], v. 4, n. 3, p. 488–491, 2017. DOI: 10.18203/2319-2003.ijbcp20150025. Disponível em: https://www.ijbcp.com/index.php/ijbcp/article/view/773. Acesso em: 24 oct. 2025.