Ethanol is used to treat methanol toxicity because it is a competitive inhibitor of alcohol dehydrogenase competitive inhibitor competes with substrates for the active site of enzyme. Ethanol has high binding affinity then method for alcohol dehydrogenase. This enzyme converts methane to formaldehyde into formate and formate accumulation causes blindness and affect central nervous system. Ethanol ingestion slows down the metabolism of methanol, so that kidneys, got sufficient time to filter out methanol.