Bronchitis includes acute bronchitis and chronic bronchitis, and there is no best medicine, depending on the condition, commonly used drugs are antipyretic and analgesic, expectorant, cough suppressant, bronchodilator, antimicrobials and so on. Acute bronchitis is self-limiting, symptomatic treatment. Commonly used drugs are antipyretic and analgesic (such as aspirin, ibuprofen), expectorant (such as ambroxol, bromhexine). Commonly used drugs for chronic bronchitis include cough suppressants (e.g. dextromethorphan, pentoxyverine), expectorants (e.g. ambroxol), and bronchodilators (e.g. salbutamol, aminophylline). If it is caused by a bacterial infection, apply antibacterial drugs for treatment, such as penicillin and gentamicin. However, it is important to note that the appropriate medication must be chosen under the guidance of a doctor, and should not be used on its own.