An Overview of the Anatomy and Physiology of the Nasal Passage from a Drug Delivery Point of View -- Pharmacological and Clinical Problems with a Special Focus on Nasal Drug Delivery -- Nasal as an Absorption Site: Opportunities and Challenges -- Factors Affecting the Design of Nasal Drug Delivery Systems -- Challenges in Targeting to the Nasal Passage -- Potential Targeting Sites to Brain Through the Nasal Passage -- Drug Absorption to Systemic Circulation after Nasal Drug Delivery -- Delivery of Vaccine through Nasal Drug Delivery System -- An Overview on Nano Carriers for Nasal Delivery -- Biomedical Applications of Nano Carriers in Nasal delivery -- Novel muco-adhesive polymers for nasal drug delivery -- Novel approaches in Nasal in situ gel drug delivery -- Nasal delivery of high molecular weight drugs recent trends and clinical evidence -- Nisosomes based drug delivery in targeting the brain tumors via nasal delivery -- Nano suspension- A Novel Drug Delivery System via Nose to Brain drug delivery -- Different Strategies for nose-to-brain delivery of protein and peptide molecules -- Regulatory requirements related to Nasal drug delivery -- Is there a global market and opportunities for nasal drug delivery. .