Sudafed Chesty Coughs with Decongestant Liquid Sudafed Chesty Coughs with Decongestant Liquid relieves chesty coughs & helps clear the stuffy, blocked up feeling in your nose & sinuses & reduces catarrh in adults & children over 12 years of age. It contains pseudoephedrine hydrochloride, a decongestant that relieves nasal & sinus congestion & guaifenesin, an expectorant that helps to loosen the mucus in your throat & chest. Sudafed Chesty Coughs with Decongestant Liquid is cherry flavoured.