Whatis the different between expectorant, mucolytic and antitussive?

Lets see? Expectorants and mucolytics tend to loosen up thick mucous and allow you to expectorate (spit up and out). Anti-tussives help to suppress coughs. Cough is good to get inflammation and infections out of the bronchial tubes. If annoying, then antitussives may help to get some sleep. Drink lots of water, use a humidifier and rest. Stay at home.