An anti-inflammatory-containing plaster is provided. The anti-inflammatory-containing plaster may include, e.g., a styrene-isoprene-styrene block copolymer, a high molecular weight polyisobutylene, a low molecular weight polyisobutylene, a tackifier, a plasticizer, a dispersant, and an anti-inflammatory having a carboxyl group or a salt thereof. However, the anti-inflammatory-containing plaster does not contain L-menthol. The anti-inflammatory-containing plaster has medicament release rates of 20-64% by mass and 40-93% by mass at one hour and three hours, respectively.
