If you're making a post with 3 substances and just saying good idea, chances are you're probably pretty inexperienced with drugs, and shouldn't be doing them.
Sorry, it just frustrates me when people make posts about wondering how wrecked they will get if they take a xanax and a beer or whatever. I have no idea your tolerance or anything, I can't tell what's a good idea. Research the drugs and interactions, then if you have questions ask. I find it's the people who just randomly do drugs and ask if it's a good idea for this and that or whatever, are the ones who end up ruining it for everyone, and are often immature, and usually underage.
I'll admit I was once underage and a drug user, but I researched everything extensively. Would drive me crazy when friends were talking about wrong info with drugs.
If you can't take the time to do real research on drugs, then you should not be allowed to do them.