This textbook on pharmacology is tailored to align with the syllabus set by the Pharmacy Council of India for undergraduate students. It covers fundamental pharmacology principles and applications, including drug mechanisms, interactions, and dynamics such as absorption, distribution, metabolism, and excretion. The book explores key concepts like receptor theories, signal transduction, and dose-response relationships. While primarily designed for pharmacy students, it is also valuable for those in related paramedical fields. We welcome constructive feedback to enhance the quality of this work and are grateful to educators, students, and our families for their support throughout this project.