J. N. NWANGWA; A. L. UDEFA; P. M. OBI; C. E. OBETEN; S. OKPA. The Hepatotoxic Effect of Sildenafil Citrate and Its Combination with Tramadol on Male Wistar Rats is Ameliorated with Vitamin E Supplementation. Archives of Current Research International, [S. l.], v. 18, n. 1, p. 1–10, 2019. DOI: 10.9734/acri/2019/v18i130123. Disponível em: https://journalacri.com/index.php/ACRI/article/view/356. Acesso em: 21 sep. 2025.