yeah tussin is better then vicks. Vicks is kinda thick too, i recomend 6-10oz for a fun trip. Just depends on body weight, ppl under 150 6oz is fine. 150-200 8oz. 200+10oz. 10oz is my norm dose, im 225. I have noticed that if i do it on an empty stomach i throw up. So i always grab some taco bell/stand, b4 tripping. then between bottles 1-2 slices of whole wheat bread. (i dont like white). OH! also, i wait 15-20 min between bottles, only reason being my stomach is fairly sensative and this seems to help rather then take all 8-10 at once.