Actually, 118 ml or a 4 ounce bottle, but yeah, half the bottle will do something, but the whole bottle is fine and isn't that crazy. The 350 number that you are referring to is the miligrams of dxm in a 4 ounce bottle, well 354 to be exact, and for a first timer 240 mg to a whole bottle is needed. I once went through 3 bottles in a day and that was crazy, but one bottle is fine.