Benylin Chesty Cough & Cold Tablets Benylin Chesty Cough & Cold Tablets relieve the symptoms of colds & flu, including aches & pains, headache, blocked nose, sore throat, chills & 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. Benylin Chesty Cough & Cold Tablets are suitable for adults & children over 12 years.