ABID, Z.; YOUSUF, S.; QURESHI, F.; RIZVI, S. M.; OMMID, M.; QURESHI, F.; MASOOD, A. Comparison of butorphanol-drotaverine versus tramadol-drotaverine as labour analgesics: an observational comparative study. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, [S. l.], v. 14, n. 8, p. 2636–2642, 2025. DOI: 10.18203/2320-1770.ijrcog20252336. Disponível em: https://www.ijrcog.org/index.php/ijrcog/article/view/15677. Acesso em: 26 oct. 2025.