A medication-containing container is provided with a container body having at the front end side thereof a mouth section through which liquid can enter and exit the container body and consisting of a flexible material, and also with a medication contained in the container body and dissolved by the liquid flowing into the container body through the mouth section. In the medication-containing container, the container body has a pair of flat sections provided facing each other with a gap therebetween in an initial state in which the container body is not yet filled with the liquid, a frame section provided on the outer peripheries of the flat sections, and an easily deformable section for interconnecting at least either of the pair of flat section and the frame section. When the container body is filled with the liquid, the easily deformable section deforms to cause the flat sections to separate from each other, increasing the gap between the flat sections to a level greater than that in the initial state to increase the volume of the container body.
