Ethyl alcohol is actually the intoxicating substance in alcoholic drinks. However, it is already included in many foods such as bread, orange peel, ready-sold dough; and our body needs it to a certain extent. In Qur’an Al-Karim, the word ‘alcohol’ is not mentioned. The Glorified Allah forbids consuming intoxicants. However, drinks and other foods do not intoxicate as long as the ratio of alcohol within them reach a certain amount. If a substance includes sugar or starch, ethyl alcohol emerges in it, although you do not interfere. If you do interfere and add more than a certain amount of alcohol to drinks, they become intoxicant and forbidden.
As a result, those drugs do not intoxicate and therefore are not forbidden.