The invention relates to novel immunogens, antibodies, methods and kits for use in immunoassays to detect and quantify zaleplon, metabolites of zaleplon and indiplon. These are the first described immunoassays for these compounds and have greater sensitivity than alternative analytical techniques.

A method of treating insomnia comprising administering to a subject a formulation including zaleplon, wherein the formulation is adapted to release the zaleplon after a lag time of at least about one hour after administration of the formulation, and during which substantially no drug substance is released

A biodegradable, multi-layered controlled release gastroretentive dosage form which is optionally divided into a first dosage of zaleplon for controlled release and a second dosage of zaleplon for immediate release in the stomach and gastrointestinal tract of a patient, folded into a capsule which disintegrates upon contact with gastric juice and the gastroretentive dosage form unfolds rapidly upon contact with gastric juice. The biodegradable, multi-layered gastroretentive dosage forms of the i...

A biodegradable multi-layered controlled release gastroretentive dosage form which is optionally divided into a first dosage of zaleplon for controlled release and a second dosage of zaleplon for immediate release in the stomach and gastrointestinal tract of a patient folded into a capsule which disintegrates upon contact with gastric juice and the gastroretentive dosage form unfolds rapidly upon contact with gastric juice. The biodegradable multi-layered gastroretentive dosage forms of the inve...