Solid preparation containing single crystal form

1. A tablet comprising crystal A of 2-(3-cyano-4-isobutyloxyphenyl)-4-methyl-5-thiazolecarboxylic acid with an X-ray powder diffraction pattern having specific peaks at a reflection angle 2θ, of 6.62°, 7.18°, 12.80°, 13.26°, 16.48°, 19.58°, 21.92°, 22.68°, 25.84°, 26.70°, 29.16° and 36.70°, an excipient, and a disintegrating agent, wherein the average particle diameter of the crystal A is from 12.9 μm to 26.2 μm.

2. The tablet according to claim 1 , wherein the tablet is prepared by a wet granulating method.

3. The tablet according to claim 1 or 2 , wherein said excipient is one or more selected from the group consisting of lactose and partly pregelatinized starch.

4. The tablet according to claim 1 or 2 , further comprising hydroxypropyl cellulose as a binder.

5. The tablet according to claim 1 or 2 , wherein the tablet is coated with polyethylene glycol.

6. A method for producing the tablet according to claim 2 comprising combining said crystal A of 2-(3-cyano-4-isobutyloxyphenyl)-4-methyl-5-thiazolecarboxylic acid with an X-ray powder diffraction pattern having specific peaks at a reflection angle 2θ, of 6.62°, 7.18°, 12.80°, 13.26°, 16.48°, 19.58°, 21.92°, 22.68°, 25.84°, 26.70°, 29.16° and 36.70°, an excipient, and a disintegrating agent, wherein the average particle diameter of the crystal A is from 12.9 μm to 26.2 μm.

7. The method for producing a tablet according to claim 6 , comprising a step of wet granulating.

8. The method for producing a tablet according to claim 6 or 7 , wherein said excipient is one or more selected from the group consisting of lactose and partly pregelatinized starch.

9. The method for producing a tablet according to claim 6 or 7 , wherein hydroxypropyl cellulose is added as a binder.

10. The method for producing a tablet according to claim 6 or 7 , comprising a step of coating the tablet with polyethylene glycol.