A transdermally absorbable preparation in which a basic anti-inflammatory analgesic is formulated is provided to be an external adhesive patch, which has excellent drug releasing without damaging the physical properties of a plaster. The preparation can achieve high releasing of the basic anti-inflammatory analgesic without losing the releasing of the local anesthetic. Specifically provided is a transdermally absorbable adhesive patch, which contains both the basic anti-inflammatory analgesic and the local anesthetic as the absorption promoter for the basic anti-inflammatory analgesic. The basic anti-inflammatory analgesic has the acid dissociation constant (pKa) of 7 or more. The content of the basic anti-inflammatory analgesic is from 0.1% to 10% by weight to the total weight of the drug-containing plaster, and the content of the absorption promoter is from 0.01% to 20% by weight to the total weight of the drug-containing plaster in the transdermally absorbable adhesive patch.
