The side effects of cold medicine are basically side effects, but the side effects are often not very serious, or even feel, as long as they are not long-term, there will not be too much harm to the body, such as the following: 1, cold medicine side effects are generally dizziness, fatigue, nausea, epigastric discomfort, dry mouth, loss of appetite, rash, etc. 2, there is a vast majority of cold medicine and acetaminophen this component, can damage liver and kidney function. 3, if the cold medicine contains chlorpheniramine maleate, diphenhydramine, terfenadine and other ingredients, then we should pay attention to the side effects of drowsiness, if taking this type of cold to be careful not to drive or carry out dangerous operations such as heights. 4, if the cold medicine contains pseudoephedrine, this ingredient has the effect of raising blood pressure, so people with high blood pressure should avoid taking. People should avoid taking it.