Nasal delivery systems are methods used to administer medications through the nasal cavity. This route allows for rapid absorption into the bloodstream, bypassing the digestive system and liver, which can enhance the effectiveness of certain drugs. Common forms of nasal delivery include sprays, drops, and powders, making it a convenient option for patients. These systems are often used for various treatments, including allergy relief, pain management, and vaccination. The nasal mucosa is highly vascularized, which facilitates quick onset of action. Additionally, nasal delivery can improve patient compliance, as it is generally easier and less invasive than injections or oral medications.