Abstract: A transdermal patch containing a drug comprising formoterol and/or a salt, a solvent for the drug, a pressure-sensitive adhesive comprising an ethylene/vinyl acetate copolymer resin and at least one of a filler and a plasticizer. The patch is substantially water-free. The patch serves to promote percutaneous absorption of the formoterol and/or a salt thereof and allow the efficacy of the drug to stably persist for a long period of time. The patch is thus effective for diseases such as asthma, which can be cured or prevented by exciting &bgr;-receptors.