Don't start getting anxious before your first "trip". Use the search engine and look up DXM. You should probably do some research first. Saying 400mg isn't good enough. Here is an example. How old are you?( for experience sake). Have you "tripped before"? What are you expecting? Are there any other drugs involved? What will you do, if things do not go right? Do you have a sitter, friend to hang with? See my point. I tripped on DXM probably 100 times. There are a few things you need to know, before you up and dose 400mg. It can be enlightening, scary, dull, crazy. I suggest you read the DXM faq. DXM is no joke. If you understand that much, great. It is not a classical psychedelic. Mixing different things will give you different results. Tripping with some friends, listening to a Dead album might be perfect. Spazzing out to EMT's and police, because you don't understand what's going on is quite different. Go read DXM information on here and check out the Erowid DXM vault while you're at it. If you want me to treat you like you know some shit and can handle yourself, remember set and setting, I don't recommend mixing other drugs this first time. Start low, like 100mg-200mg and watch a movie. Be in a mentally happy place. Don't drink any ALCOHOL. You should be able to handle that. I seriously advise reading the faq and any other threads on here. Most importantly, make sure the product is DXM ONLY. After searching and understanding what you want to do, post in Basic Drug Discussion. You will get a lot of help there. Psychedelic Drugs also has threads. Everyone is different. My good time could suck for you. This is called being subjective. Just because candyflipper123 can drink 24 ounces and have a wonderful time, doesn't mean anything. Nobody knows what meds you take or how they will effect you. DXM is pretty tame at lower dosages, but you have to be prepared none the less. Have fun.