Okay, I get a cold once in a while but the only things I take are Ricola (Reeeeeecooolaaaaa, to stop the coughing), Theraflu (soothing to go to sleep), Nyquil (knocks me out so I can sleep), and Sudafed (not actually for treating any symptoms but because it makes me so happy I can get through the day) or their generic knock-offs.
All of that just to tell you I don’t buy cough medicine so the fact that they don’t work doesn’t bother me at all.