Intranasal administration is a method of delivering drugs or other substances through the nasal cavity. This route of administration is commonly used for medications that require rapid absorption or have poor oral bioavailability. Intranasal administration bypasses the digestive system and liver, allowing for more direct and rapid absorption into the bloodstream. This method is often used for drugs that act on the central nervous system, as the nasal cavity provides a direct route to the brain. Additionally, intranasal administration is non-invasive, convenient, and well-tolerated by patients. Research in this area focuses on optimizing drug delivery systems, improving absorption and bioavailability, and exploring new therapeutic applications.