The oral mucosa has a thin epithelium and a rich vascularity that favors absorption, but contact is usually too brief, even for drugs in solution, for appreciable absorption to occur.

 
  • 口腔粘膜上皮很薄,血管丰富,有利于药物吸收。但是,接触的时间太短暂,即使是溶液剂也来不及等到明显的吸收发生。
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