The sad reality behind the ‘efficacy’ of those cough medicines! –
Coughs are one of the leading reasons for visits to the doctor and trips to the drugstore, where shelf-long displays of nonprescription cough medicines can overwhelm even the most discerning consumer. And Americans spend some $8 billion a year on over-the-counter cough and cold products.
Yet evidence is sorely lacking for the value of any over-the-counter remedy to treat most coughs, be they wet or dry. More likely, any significant benefit people get from cough medicine is probably due primarily to the placebo effect: You think — you hope — it will help, so it does, at least temporarily. But even when cough medicines help a little, they do not cure or shorten the duration of a cough.