Chemical poisonings often can damage the liver cells, causing metabolic enzymes system obstacles, or make oxidative phosphorylation process, generate ATP, cause liver cells, causing degeneration necrosis of abnormal liver function, Some drugs, such as chlorpromazine, ammonia LiuSuan, isoniazid, some DianAn drugs and antibiotics, even therapeutic doses can cause liver damage, the minority is the most common one of the reason of abnormal liver function, it may be related with allergies, usually within a few days after discontinuation of liver function can be restored.