Cough, runny nose and sneezing are the most likely set of symptoms when you have a cold, and you should go for targeted treatment drugs according to your symptoms. Compound cold medicines often contain the following ingredients, as follows: 1, cough: the current cold medicine more common cough ingredients, the most is dextromethorphan, is through the inhibition of the central cough reflex, thereby inhibiting the cough response; 2, sneezing: is a typical manifestation of allergic reactions, commonly used drugs are anti-allergy drugs. The more present in cold medicine is chlorpheniramine, which is an antihistamine; 3. Runny nose: for the symptoms of runny nose need to reduce the swelling of the nasal mucosa to reduce the secretion of mucus, the most common is pseudoephedrine. Cough to choose the composition containing dextromethorphan, sneezing need to choose the composition containing chlorpheniramine or benadryl type of anti-allergy, runny nose need to choose the cold medicine containing pseudoephedrine composition.