If you have a bad cold for a long time, you should first have a chest CT examination to rule out the occurrence of lower respiratory tract infection due to a cold. If a lower respiratory tract infection occurs, treatment according to the common cold often does not lead to recovery and requires hospitalization for intravenous drip drug treatment, which is more effective. If bronchitis and pneumonia do occur, long-term colds are often bacterial infections, and Mycoplasma pneumoniae infections are more common. If bacterial infections occur, intravenous drips of cephalosporin antibiotics, such as ceftriaxone and cefoperazone, are needed. In adults, levofloxacin may also be used for intravenous drip treatment. In case of bronchitis or pneumonia caused by Mycoplasma pneumoniae infection, intravenous azithromycin can be used for treatment. In addition, cold treatment, if the use of incorrect drugs, can also lead to long-term cold bad phenomenon, such as viral colds, not to use antibiotics, you need to use antiviral drugs, such as ribavirin, Tamiflu. If the cold is bacterial, you must use antibiotics for treatment, ordinary antiviral drugs, cold medicine, the effect is not very good, for example, you can take oral cefixime.