there’s a handful of recreational drugs (mainly MDMA/stimulants and psychedelics) that have a positive affect on stutters (reducing frequency/ stopping all together) however the positive of not stuttering while your on one is not worth the negative side affects. If you are doing a drug to avoid your stutter you’re using the substance as a crutch and it’s much easier to fall into addiction as you’ll tell yourself “I need this to be normal, my stutter is helped by ‘X’ I’ll keep doing it” I’d avoid taking drugs as a form on dealing with your stutter, it’s a dangerous fix that won’t work for everyone and has a high chance of putting you in a worse position than having a stutter. Take it from someone who’s tried it, it’s not worth it.