<p>Disclosed is a novel dosage form for oral administration. Specifically disclosed is a porous dry matrix preparation comprising at least a polymeric thickening agent and an excipient, wherein (1) the content of the polymeric thickening agent is 0.5 to 14 w/w% inclusive; (2) the content of the excipient is 30 to 80 w/w% inclusive; (3) the void ratio is 20% or more; and (4) the water activity is 0.55 or less or the water content is 10 w/w% or less.</p>
