The objective of the present invention is to provide a method for preventing denaturation by oxygen of drugs inside a patch that is enclosed in a packaging container. The present invention is a packaging comprising a packaging container and a drug-containing patch that is enclosed inside the packaging container, wherein the amount of oxygen gas is 20 [mu]L or less and the concentration of oxygen gas is 17.0 to 25.0 volume% in the packaging. This packaging does not have to comprise an oxygen absorber that is separate from the drug-containing patch. Further, the amount of oxygen gas may be 4 [mu]L/mg or less per drug amount in the drug-containing patch.本發明之目的在於提供一種防止已封入包裝容器內的貼付劑中的藥物因氧而改質之方法。本發明提供如下包裝體，其具備包裝容器與已封入前述包裝容器內的含藥物之貼付劑，前述包裝體內的氧氣量為20μL以下，且氧氣濃度為17.0體積%~25.0體積%。前述包裝體亦可不包含與前述含藥物之貼付劑分開之脫氧劑。又，相對於前述含藥物之貼付劑中的每毫克的藥物量，前述氧氣量亦可為4μL/mg以下。
