Dextromethorphan
"This medicine works for cough, but as the other reviewer said, it can have side effects like all medications. In my case, it makes me hyper. My 6 year old daughter had a bad dry cough and I had given this medicine to her. It turned her into "The Great Cornholio"! My child was talking so fast, I don't think she could even keep up with herself. Her Pediatrician was contacted, and they prescribed her a liquid that contained guafenesin and codeine. She is borderline ADD, and the Pediatricians office said that this medicine sometimes effects kids this way when they have ADD or Hyperactive. Anyway, my point is if you have any diagnosed condition, or suspect that you have a condition, look to see if OTC medicines will affect you in any different way."