In medical ethanol, methanol is not added at all, otherwise it will be a problem for dressing and surgery 

In medical ethanol, methanol is not added at all, otherwise it will be a problem for dressing and surgery
Drinking 10 cc of methanol causes blindness and 30 cc causes death
The only thing that is added to ethanol is a bittering agent
The most bitter substance in the world is Dentatonium Benzoate. The General Administration of Drug and Narcotic Affairs of the Ministry of Health has ordered all alcohol producing companies to refrain from adding Denatonium Benzoate (also known as Bitrex) to alcohol since the beginning of 2003. small volume that is distributed in pharmacies and hospitals. take action
This substance is currently used in more than forty countries of the world to counterfeit alcohol in concentrations of 6-50 parts per million (ppm).
Adulteration of alcohol is called the process of making it non-drinkable