Cold and dry cough may be common cold or influenza; common cold is a self-limiting disease with no specific treatment, and usually cannot be recovered quickly; taking antiviral medication for influenza may promote the recovery of the disease. 1. Common cold: the common cold antiviral treatment is ineffective, the use of cough medicine can only reduce the symptoms, and can not shorten the course of the disease. 2. Influenza: the disease is caused by influenza virus infection, the use of antiviral drugs, such as oseltamivir, can promote faster recovery and reduce complications. To summarize, when you have a cold and dry cough, you need to consult a doctor in a timely manner, under the guidance of the doctor’s targeted treatment.