Intranasal drug delivery is a method of administering medications through the nasal cavity. This approach allows drugs to be absorbed quickly into the bloodstream, bypassing the digestive system and liver, which can break down medications before they take effect. It is often used for vaccines, pain relief, and treatments for conditions like migraine. The nasal mucosa is highly vascularized, making it an effective route for rapid absorption. This method is non-invasive and can be more convenient than injections or oral medications. Additionally, it can enhance patient compliance, especially for those who have difficulty swallowing pills or receiving injections.