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Background  Acute renal failure is one of the most serious complications of envenoming resulting from  Crotalus durissus terrificus  bites. This study evaluated the relevance of hyperuricemia and oxidative stress and the effects of allopurinol and probenecid in renal dysfunction caused by direct nephrotoxicity of  C. d. terrificus  venom.    Methodology/Principal Findings  Hematocrit, protein, renal function and redox status were assessed in mice. High ratio of oxidized/reduced glutathione and hyperuricemia induced by  C. d. terrificus  venom were ameliorated by both, allopurinol or probenecid, but only allopurinol significantly reduced the lethality caused by  C. d. terrificus  venom. The effectiveness of probenecid is compromised probably because it promoted hypercreatinemia and hypocreatinuria and worsed the urinary hypo-osmolality in envenomed mice. In turn, the highest effectiveness of allopurinol might be due to its ability to diminish the intracellular formation of uric acid.    Conclusions/Significance  Data provide consistent evidences linking uric acid with the acute renal failure induced by  C. d. terrificus  venom, as well as that this envenoming in mice constitutes an attractive animal model suitable for studying the hyperuricemia and that the allopurinol deserves to be clinically evaluated as an approach complementary to anti-snake venom serotherapy.

Allopurinol Reduces the Lethality Associated with Acute Renal Failure Induced by Crotalus durissus terrificus Snake Venom: Comparison with Probenecid