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Male mice were treated with DMSO (1, 2.5 or 5 ml kg<jats:sup>\u22121<\/jats:sup>, i.p.) prior to challenge with dichloromethane (CH<jats:sub>2<\/jats:sub>Cl<jats:sub>2<\/jats:sub>) or carbon tetrachloride (CCl<jats:sub>4<\/jats:sub>). Blood carboxyhemoglobin elevation resulting from metabolic conversion of CH<jats:sub>2<\/jats:sub>Cl<jats:sub>2<\/jats:sub> to carbon monoxide was inhibited dose\u2010dependently by DMSO pretreatment. The elevation of serum aspartate aminotransferase, alanine aminotransferase and sorbitol dehydrogenase activities induced by CCl<jats:sub>4<\/jats:sub> (0.1 mmol kg<jats:sup>\u22121<\/jats:sup>) was not changed in mice pretreated with DMSO at 1 ml kg<jats:sup>\u22121<\/jats:sup>, but depressed significantly at a greater dose of DMSO. However, DMSO failed to alter the hepatotoxicity of CCl<jats:sub>4<\/jats:sub> injected at a dose of 0.2 mmol kg<jats:sup>\u22121<\/jats:sup>. DMSO induced the microsomal <jats:italic>p<\/jats:italic>\u2010nitrophenol hydroxylase and <jats:italic>p<\/jats:italic>\u2010nitroanisole <jats:italic>O<\/jats:italic>\u2010demethylase activities as early as 2 h following the treatment. Microsomal disposition of CH<jats:sub>2<\/jats:sub>Cl<jats:sub>2<\/jats:sub> and CCl<jats:sub>4<\/jats:sub> was measured using a vial equilibration technique. The disappearance of CH<jats:sub>2<\/jats:sub>Cl<jats:sub>2<\/jats:sub> was inhibited competitively by addition of DMSO. But DMSO did not affect the metabolic degradation of CCl<jats:sub>4<\/jats:sub>. The results indicate that DMSO has multiple effects on metabolism and toxicity of xenobiotics. DMSO induces the hepatic metabolizing activity mediated by CYP2E1, but the presence of this solvent in the enzyme site may inhibit directly the enzymatic interaction with a substrate. The toxicological significance of DMSO\u2010induced effects on such an interaction may be variable depending on the properties of each substrate. The invulnerability of CCl<jats:sub>4<\/jats:sub> metabolism to the effects of DMSO appears to be related to its high affinity for the lipophilic CYP enzyme site. 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