Naphazoline, the hydrochloride of which is white crystalline powder; Odorless, bitter taste. Soluble in water. It is an epinephrine drug and has the effect of constricting blood vessels. It is used for allergic and inflammatory nasal congestion, acute and chronic rhinitis. Naphthoxolin, also known as naphthoxolin, nose-eye net, is a vasoactive drug acting on the circulatory system, belonging to the adrenergic drugs, has the pharmacological activity of constricting blood vessels, local application, relieve nasal mucosal swelling and congestion. It is a direct α-adrenergic effector that constricts dilated intranasal arterioles but has no effect on β-adrenergic receptors. After topical application, the action can appear within 10 minutes and last for 2 ~ 6 hours. Clinically, it is used to treat acute and chronic nasal, eye and pharyngeal mucosa congestion caused by various reasons, such as allergy, inflammation, pathogenic microorganism infection, etc., and has the effect of relieving palpebral muscle spasm. Allergic to ephedrine can choose this product.