Beechams All in One Liquid Beechams All in One Liquid relieves the symptoms of colds, chills & flu with chesty coughs. These symptoms include headache, shivers, aches & pains, blocked nose & painful sinuses, catarrh, sore throat & a chesty, productive cough. Beechams All in One Liquid contains three active ingredients: Paracetamol: a painkiller that also reduces your temperature when you have a fever. Guaifenesin: an expectorant which loosens phlegm & relieves a chesty cough. Phenylephrine hydrochloride: a decongestant which unblocks your nose & sinuses, helping you breathe more easily.