Dextromethorphan hydrobromide is a cough suppressant that is mostly safe when used in accordance with the doctor’s instructions. In a few cases, it may cause neurological symptoms, digestive symptoms, and psychiatric disorders or other adverse reactions rather than cause harm. 1. Nervous system symptoms: for example, it may cause dizziness, headache, fatigue, drowsiness and other related manifestations. 2. Digestive system symptoms: may cause nausea, vomiting and lack of appetite, abdominal discomfort constipation and other symptoms. 3. Mental disorders: some patients may be easily agitated, confusion and so on. 4. Other adverse reactions: such as rash and atopic dermatitis, cardiopulmonary dysfunction; overdose may induce bronchospasm or lead to confusion, respiratory depression and other serious adverse reactions. Therefore, in the process of dextromethorphan hydrobromide medication need to pay attention to the observation of adverse drug reactions, once the emergence of suspected side effects need to be dealt with in a timely manner.