There is no how to cure a severe cold and cough most effectively, but it can be treated by taking medicines such as cough suppressants and phlegm removers. Drink plenty of fluids, keep warm and eat a light diet. If the cough is severe and dry without phlegm, cough suppressants such as dextromethorphan can be used to relieve the symptoms. Dextromethorphan is a centralized cough suppressant and should be used with caution in patients with excessive phlegm, pregnant women, and patients with hepatic or renal insufficiency. If there is phlegm in the cough, but it is not easy to cough it up, you can use a phlegmatic drug such as bromhexine to reduce the phlegm. It is contraindicated for those who are allergic to this drug. If you have a cough with yellow phlegm, you can take antibiotics such as amoxicillin, which is contraindicated if you are allergic to the drug. In addition, it is important to drink a lot of water, which moistens the throat, promotes metabolism and relieves discomfort. The occurrence of severe cold and cough, need to actively seek medical attention, the above drugs should be under the guidance of the doctor to follow the doctor’s instructions for rational application.