Provided are a solid preparation that can easily regulate the dissolvability of medication, and a method to improve the dissolvability of medication. The disclosed solid preparation (1) is provided with a medication-containing part (2) that contains medication, and a gel-forming layer (4) that coats the medication-containing part (2), with an intermediate layer (3) interposed therebetween, and forms a gel by absorbing water. By forming a plurality of pores (6) in the gel-forming layer (4) extending from the surface thereof to the intermediate layer (3), the dissolvability of the medication is improved. The gel-forming layer (4) can be coated with an adhesion prevention layer (5) and pores (6) can be formed in the adhesion prevention layer (5) extending from the surface thereof and contiguous with the pores in the gel-forming layer (4). The medication-containing part (2) can contain cationic or basic medication, and the gel-forming layer (4) can contain an anionic or acidic polymer.
