The textbook "Time and Site Specific 'Tablets in Capsule' System for Nocturnal Asthma" offers a comprehensive investigation into the development of an innovative drug delivery system specifically tailored to the needs of individuals with nocturnal asthma. The focus is on a 'Tablets in Capsule' system that enables both immediate and pulsatile release of the active ingredient theophylline, simulating the circadian rhythm of the condition. The work describes the formulation of two tablets within a capsule, with the first tablet serving as an uncoated loading unit and the second tablet coated with special polymers to ensure targeted release in the colon after a defined delay. By optimizing the amounts of polymers and coating techniques, an effective and controlled drug release is achieved, which has been tested in various pH media.