(KABC) --A new study finds that over-the-counter cough medicine may not work in adults.Just last week the FDA warned parents not to use cough syrups for children under two. A health group reviewed 25 studies on how well cough medicine works in adults. It found that it's actually unclear whether any of the cough syrups work any better than a placebo.
But many of those studies that showed a positive result were done by pharmaceutical companies.
The authors of this new study say there may be a potential industry bias.