This book entitled "Relationship Between Asthma and Rhinitis: An Unsolved Molecular Mystery" is targeted for the Pharm. D., Medical Students and Research Scholars. The chapter covers introduction about the respiratory pharmacology and describe the molecular approach under the main headings of Relationship Between Asthma and Allergic Rhinitis. This book "Relationship Between Asthma and Rhinitis: An Unsolved Molecular Mystery" will provide all the pertinent molecular and cellular pharmacological knowledge of students. The diagrams of this book are clear, labelled and self-explanatory.