Acute bronchitis is mostly caused by viral infections, and there is generally no specific medication for it. Therefore, patients with acute bronchitis usually do not need IV therapy. However, if a patient with acute bronchitis also has significant gastrointestinal symptoms, poor appetite, or even drinks less water, IV therapy is needed. The purpose of IV therapy is not to treat the virus but to hydrate the patient and prevent dehydration. Of course, when a patient with acute bronchitis has purulent sputum, it indicates a bacterial infection. In this case, IV therapy can be considered. The usual treatment duration for acute bacterial bronchitis is 5-7 days, but this must also take into account the patient's specific conditions and results of tests like the complete blood count, and cannot be generalized.