Solid rapidly disintegrating dosage form

A solid, rapidly disintegrating dosage form of an effervescent tablet for producing an aqueous suspension for peroral administration, said dosage form comprises fine particles of micronized diclofenac having an average particle size smaller than 200 m.mu., said particles individually coated with a coating material selected from the group consisting of polyvinylpyrrolidone, a lower alkyl ether of cellulose, and a permeable, swellable acrylate/methacrylate copolymer, or a correspondingly coated pharmaceutically acceptable salt of diclofenac, together with excipients suitable for solid effervescent formulations, suspending aids, and further optional pharmaceutical excipients.