57 A transdermal delivery system suitable for administering a weakly acidic or basic drug is described which comprises a substantially impermeable backing member, a drug reservoir comprising the drug, a hydroxylated solvent and a buffering agent, and a membrane selectively permeable to the unionized form of the drug and substantially impermeable to the ionized form of the drug and the buffer salts.
57 描述了一种适用于施用弱酸性或弱碱性药物的透皮给药系统,该系统包括一个基本不透
水的衬垫部件,一个由药物、羟化溶剂和缓冲剂组成的药物贮存器,以及一个可选择性渗透药物结合形式、基本不渗透药物离子化形式和缓冲盐的膜。