摘要：

PROBLEM TO BE SOLVED: To obtain a newly prepared fentanyl-containing percutaneously absorbable administration matrix type patch including fentanyl or a salt thereof, having easiness for administration and control of adjustment of dosage and also, short percutaneous absorption delay time (time for cutaneous permeation rate to reach its steady state) (within 4 h) and capable of stably maintaining its effects by keeping stable blood concentrations.

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