im lookin for a quick answer.... i weigh around 135lbs and i need to know how much robitussin i would need to drink to feel the dxm. the bottle is a 118ml
nononononononoooooooooooooooooooooo bad. Use the search module for DXm extraction techniques, chugging that stuff is a quick way to VomitLand.
just make sure that the tussin you have is robitussin maximum strength, where the only active ingredient in it is dxm. as to your question, chug down the whole bottle.