The book provides the detail introduction of Chronopharmacology. Chronopharmacology is the study of how biological rhythms, such as circadian rhythms, influence the absorption, distribution, metabolism, and effects of drugs. It examines the timing of drug administration and its impact on efficacy, safety, and patient outcomes.The book itself describes the pharmacokinetic and pharmacodynamics process invlove in chronopharmacology. It also gives the detail information of chronotoxicology, biological clocks how they affect the chronopharmacology. The book describes the applications and various challenges and future Perspectives in chronopharmacology.