This invention provides a transdermal absorption preparation which sustainedly releases the basic drug from the preparation at a constant concentration for a long period, such as 1 to 7 days. Few amount of the drugs are decreased over time even if there are a lot of drugs in the preparation. Besides, the method for processing the preparation is easy. The transdermal absorption preparation is composed of an adhesive layer containing basic drugs and water-soluable high molecules as well as a support.本發明係提供一種經皮吸收型製劑,其能夠使鹼性藥物以持續且一定的濃度,長期(1~7日間)自製劑釋放,進而,即便於製劑中含有大量藥物,藥物之經時性含量降低亦少,且其製造步驟亦容易。在經皮吸收型製劑中,其結構是設作具有:含有鹼性藥物和水溶性高分子之黏著劑層、及支撐體。
