If you're gonna do that much DXM or DXM at all, you should stick to pure powder DXM, I know how to extract it from Triple C's and it is so much better, plus you can actually piss (I hate not being able to piss while I'm tripping). 1,800 mg is insane, most I've done is around 1,400 mg, didn't sleep that night, just laid in bed staring at a tree cause I though I was really in it.