Left hydrochloride cetirizine (Levocetirizine Hydrochloride) is Cetirizine triazine (Cetirizine) activity of enantiomers， as a new second-generation antihistamines， H1-receptor with high affinity and also can inhibit allergic inflammation related to the various media and the release of anti-inflammatory play a wider role for the excellent treatment of allergic rhinitis Clinical use mostly oral formulations， mainly through the gastrointestinal absorption， through the distribution of systemic blood circulation， thereby inflammatory mediators histamine antagonist role achieve systemic treatment of allergic Allergic rhinitis for partial nasal allergies， systemic administration of local low plasma concentrations， but large doses of the oral route application potentially serious systemic adverse reactions dangerous， is not an ideal way of The combination left hydrochloride cetirizine the physical and chemical properties and pharmacological characteristics of the role， a nasal spray developed by local allergic inflammation increases the body parts of the local organization of free drug concentration to be effective antagonist of histamine allergens， better play to their local anti-allergic and anti-inflammatory effects and reduce adverse reactions
