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Nasal sprays are used as local treatments for conditions such as nasal congestion and allergic rhinitis. In some situations, nasal delivery route is preferred because it provides an agreeable alternative to injection or pills. Substances can be assimilated extremely quickly and directly through the nose. Many pharmaceutical drugs exist as nasal sprays for systemic administration (e.g. treatments for pain, migraine, osteoporosis and nausea). Other applications include hormone replacement therapy, treatment of Alzheimer's disease and Parkinson's disease. Nasal sprays are seen as a more efficient way of transporting drugs with potential use in crossing the blood–brain barrier. ==Antihistamine sprays== Antihistamines work by competing for receptor sites to block the function of histamine, thereby reducing the inflammatory effect. Antihistamine nasal sprays include: * Azelastine hydrocholoride * Levocabastine hydrocholoride * Olopatadine hydrochloride 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「nasal spray」の詳細全文を読む スポンサード リンク
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