Drinking water is not recommended immediately after drinking cough syrup, but usually after 5 minutes. This is because cough syrup is mainly absorbed through the gastrointestinal tract and the drug covers the mucous membrane in the throat to achieve the purpose of cough. If you drink water immediately after drinking cough syrup will dilute the drug so that the viscosity of the drug decreases, affecting the therapeutic effect of the drug, is not conducive to the treatment of the disease, so it is recommended not to drink water immediately after drinking cough syrup. There are many kinds of cough syrup, some cough syrup adverse reactions and contraindications are not clear, need to be used under the guidance of a doctor or pharmacist. During the treatment period, you also need to pay attention to rest and eat a light diet, avoid eating indigestible food, to prevent affecting the recovery of the body.