Srivastava, K., Sinha, P., Sharma, R., & Gupta, U. (2017). A comparative study of the effect of drotaverine hydrochloride with hyoscine butylbromide in first stage of labor. International Journal of Basic & Clinical Pharmacology, 4(3), 488–491. https://doi.org/10.18203/2319-2003.ijbcp20150025