Benylin Mucus Cough & Cold All in One tablets offer relief of symptoms associated with colds and flu, including aches and pains, headache, blocked nose and sore throat, chills and chesty coughs. They contain three active ingredients: __Paracetamol:__ a pain reliever (analgesic) that also helps to reduce your temperature when you have a fever. __Guaifenesin:__ an expectorant to help loosen phlegm. __Phenylephrine:__ a decongestant to reduce swelling in the passages of the nose to help you breathe more easily.