Sudafed Mucus Relief Triple Action Cold & Flu Tablets Sudafed Mucus Relief Triple Action Cold & Flu Tablets provide relief from symptoms of colds & flu, including aches & pains, headache, blocked nose, sore throat, chills & chesty coughs. They contain three active ingredients: Paracetamol: A pain reliever that also helps to reduce your temperature when you have a fever. Guaifenesin: An expectorant to help loosen phlegm. Phenylephrine: A decongestant that reduces swelling in the passages of the nose to help you breathe more easily.