"1. Know your limits. Try not to be that person who gets too fucked up to function at a show. Believe me, it's not fun to be the babysitter when you were expecting to enjoy yourself.
2. On the flip side, if you do make a mistake and go overboard once, learn from that mistake and don't repeat it. If you've had more than one bad experience with a particular substance, acknowledge that it might be time to throw in the towel with that specific party enhancer. Again: KNOW YOUR LIMITS.
3. Try not to buy drugs from strangers. At the very least, try to get a recommendation from a friend. I've met drug dealers I didn't know who sold me quality product with which I had an enjoyable evening, and I've met others selling shit that caused mass freak-outs at events because it wasn't what the dealer said it was. Buyer be-very-ware.
4. Educate yourself. I've talked to party girls spun out of their skulls on pressed molly who were horrified at the offer of a little pot-smoking session, explaining, "I only take pills because they aren't real drugs." Regardless of whether you approve of marijuana, I think we can all agree that stance is ridiculous. Learn as much as you can about what you're ingesting, what it's doing to your brain and body, the risks and the potential side effects. It should go without saying, but just in case: If comes in a pill form -- even if it comes from a pharmacy -- that doesn't mean it's a risk-free substance.
5. Educate yourself some more. You'll make friends at shows -- friends who might offer you free drugs, which is always fun. So know what free drugs might be available to you, and then determine the free drugs you'll accept with a smile and which ones you'll politely but firmly decline, and keep those boundaries crystal clear in your head, because you won't be thinking at your best if someone offers you more drugs after you're already under the influence. And if you are already under the influence and someone offers you more drugs, it's good for your life expectancy to know how those drugs are going to interact.
6. Buddy up. If your plan is to go to a show and take drugs, make sure there are at least one or two people in attendance you can trust and that you're checking in with someone throughout the night.
7. Look out for your friends -- and other people, too. If the girl standing next to you who you've been chatting with suddenly seems disproportionately messed-up, and the dude standing next to her, whom she's given no indication of knowing at all during the evening, is trying to lead her away, you have a responsibility in that situation. Step up. Say, "Excuse me, that's my friend," and wait for an explanation about what he's doing -- even if you just met. That's a lot easier with people you know, because you can identify normal and abnormal behavior more readily, but I think it behooves all of us to make musical spaces safe spaces for everyone and call out creeps.
8. If despite all of your precautions, shit is still hitting the fan, then do the right thing and get medical attention as soon as possible. Even if your religious family will be mad at you, even if you'll have to talk to cops while you're high. There are a lot of things in life you can overcome, including criminal charges and court cases; death, though, isn't one of them, and there's too much beautiful music in the world to leave it early because someone -- maybe you -- lacked a little responsibility and perspective."
Backbeat
http://blogs.westword.com/backbeat/2014/08/drugs_music_festivals_advice.php?page=2