After taking cold medicine after cold aggravation is not necessarily cold medicine did not work, but also may be the normal development process of the disease itself, the cold for about 3 days is more serious, and the early stage of the cold oral cold medicine may not play a very good effect, and the main effect of the cold medicine is to alleviate the clinical symptoms caused by the cold, from the root not to treat the cold. If you have a more serious cold such as influenza, just oral cold medicine is not enough, may be further aggravated, but also need to choose the antiviral drugs for influenza, clinical efficacy is better, including oseltamivir, amantadine, ribavirin and so on.