Cough suppression
Cough suppression is a common effect of various drugs, that can be described as a decrease in the desire to cough. This can be a positive effect which either suppresses a preexisting cough, or allows an individual to inhale large amounts of smoke without having the desire to cough. This effect commonly can occur on DXM, many opiates such as codeine, as well as anticholinergics such as promethazine, and DPH.