PURPOSE: A double-layered tablet containing zaleplon is provided to improve stability of medicinal use and convenience and improve sleeping quality. CONSTITUTION: A double-layered zaleplon-containing tablet contains immediate release layer and sustained release layer. The tablet is produced by stirring 0.1N of hydrochloric acid buffer and pH 6.8 of phosphoric acid buffer at 50-200rpm. The immediate release layer contains zaleplon, lactose, maltose, microcrystalline cellulose, Sodiumlauryl sulfate and at least one additive. The sustained release layer contains zaleplon, maltose, microcrystalline cellulose, polymer and at least one additive. The additive is disintegrant, glidant, or lubricant.
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