Sudafed Mucus Relief 0.1% Nasal Spray Sudafed Mucus Relief 0.1% Nasal Spray is a quick & easy way to help clear the stuffy, blocked up feeling in your nose & sinuses caused by colds & allergies such as hayfever for up to 10 hours. As it targets nasal mucus directly, it's clinically proven to start relieving congestion within minutes. The active ingredient xylometazoline hydrochloride is a decongestant that helps to reduce the amount of mucus & congestion in your nasal passages. Sudafed Mucus Relief 0.1% Nasal Spray is suitable for adults & children aged 12 years & over.