Article Na‘naa‘ al-Madeenah, published in Majallat Markaz Buhooth wa Diraasaat al-Madeenah, issue no. 11, p. 179, 183, 184
The fact that menthol belongs to the hydroxyl group -OH does not make it forbidden and it does not mean that it is an intoxicant.
We asked a specialist in the field of chemistry and he answered that this substance – menthol – is not an intoxicant.
The basic principle with regard to all drinks is that they are halaal (permissible) unless they are intoxicants or are harmful.
The mere presence of alcohol in a drink does not mean that it is haraam, unless it reaches the level of causing intoxication. If the amount of alcohol is small and well absorbed in the material, then the drink is not haraam.
It says in a statement of the Islamic Fiqh Council of the Muslim World League:
It is permissible to use medicines containing negligible amounts of well-absorbed alcohol required in manufacturing that cannot be substituted, so long as that medicine is prescribed by a doctor of good character. It is also permissible to use alcohol for external cleaning of wounds, to kill germs, and in creams and lotions that are used externally. End quote.
Qaraaraat al-Majma‘ al-Fiqhi al-Islami, p. 341