The main ingredient of counterfeit alcohol is methanol, and the symptoms of methanol poisoning are mainly manifested after drinking counterfeit alcohol. The main clinical manifestations are immediate drunkenness, symptoms of damage to the central nervous system, optic nerve and retina. 1. Symptoms of central nervous system: dizziness, headache, fatigue, staggering gait, insomnia, confusion, mania, epileptic seizures in severe cases, and even extrapyramidal damage. 2. Eye symptoms: blurred vision, black shadow, eye pain, diplopia, or even a sharp decrease in vision. 3. Other symptoms: nausea, epigastric pain, tachycardia in a few cases. When there are symptoms of methanol poisoning, go to the hospital for treatment in time to avoid causing more harm.