Synolin is an alcohol free saline formula containing 0.9% sodium chloride.Synolin nasal spray cleanses the nasal cavities by thinning and washing-out excess mucus and mucus-trapped impurities such as pathogens, allergens and pollutants, helping to keep the nose healthy and preventing secondary ENT infections.Synolin nasal spray helps relieve nasal symptoms such as obstruction and mucus discharge caused by common cold and allergies, helping to improve nasal breathing. It also moistens nasal mucosa in dry conditions.