An immediate release solid dosage form in tablet or pellet form for oral administration of a PDE 4 inhibitor, comprising a PDE 4 inhibitor that is N-(3,5-dichloropyrid-4-yl)-3-cyclopropylmethoxy-4-difluoromethoxybenzamide (roflumilast) or a salt thereof, and one or more suitable pharmaceutical excipients; wherein said dosage form contains 500 μg of the roflumilast or salt thereof.