A dry cough after a runny nose can be caused by bacterial, viral or mycoplasma infections of the respiratory tract, which are treated according to the infecting pathogen. For bacterial infections, drugs such as cefdinir can be taken. 1. Viral infections: such as rhinovirus, adenovirus, respiratory syncytial virus and other infections, you can take antiviral oral solution and other drugs to treat. 2. Bacterial infections: such as Streptococcus pneumoniae, Escherichia coli and other infections caused by the cough is usually severe, it is recommended to use broad-spectrum antibiotics, such as cefdinir, cefotaxime, etc.; if the symptoms are serious, blood cultures should be done to determine what kind of pathogenic bacterial infections, and then use the medication accordingly. 3. Mycoplasma infection: if for mycoplasma infection can take azithromycin and other treatments; if the cough is serious, you can use the compound Folcodin syrup to calm the cough. In short, children with a dry cough after a runny nose should go to the hospital in a timely manner. The above drugs need to be used under the guidance of a doctor.