Okay so I did DXM for the first time about a week ago. So far ive done LSD MDMA(recently) MJ(of course), alcohol & DXM. So... my friend and I bought two bottles of robitussin "strength or max or some shit lol," and it had 250 ML in the bottle. I have no idea how to calculate how much DXM was in it. We chugged our bottles. Ten minutes later im feeling kinda tingly and warm. Over the next two hours I drink and smoke some bud. Nothing happend... Am I just mega fail? Or did I do something wrong.