To investigate the ameliorative effect of L-carnitine on phenylhydrazine induced oxidative damage to liver, kidney and spleen, twenty-eight Swiss albino mice were divided into four groups and injected 0.9% NaCl (control), 40 mg/kg/day phenylhydrazine, phenylhydrazine+L-carnitine or 1000 mg/kg/day L-carnitine. Malondialdehyde (MDA) level was found to be significantly (P<0.001) lower in phenylhydrazine+L-carnitine group compared to the phenylhydrazine group in all tissues. Reduced kidney glutathione (GSH) level in phenylhydrazine given group was restored to normal by L-carnitine. However, increased uric acid level by phenylhydrazine was not decreased by L-carnitine administration. It appears that L-carnitine may prevent tissue damage and lipid peroxidation induced by phenylhydrazine.