New research conducted in the UK reveals that cough syrup is medically useless. In the study, children given medicated cough syrup fared no better than those just given plain corn syrup.
Like sunscreen, sports drinks, dryer sheets and many other consumer products, cough syrup is a useless product that has no purpose other than to generate profits for manufacturers and retailers. There's no scientific evidence showing any benefit whatsoever from cough syrup and, in fact, since many brands of cough syrup contain refined carbohydrates (in the syrup), they may actually be causing harm.
The fact is, many over-the-counter medications are little more than marketing gimmicks, and cough syrup is no exception. Buying cough syrup is a complete waste of money.