Is there a certain method of extracting ingrediants from types of medicine such as Robitusson or Benadryl to only get the ingredients you want instead of all the other shit?
Yes there is, there are many methods for different drugs: For extracting the dxm out of robitussin you could do a simple acid-base extraction.
Do you think I can be bothered typing it out for you...? Nah just joking, yeah google it, Its a simple procedure, try searching "acid extraction dxm" or sumthing.