Large nasal mucosal surface area for dose absorption
Rapid drug absorption via highly-vascularized mucosa
Rapid onset of action
Ease of administration, non-invasive
Avoidance of the gastrointestinal tract and first-pass metabolism
Improved bioavailability
Lower dose/reduced side effects
Minimal aftertaste
Improved convenience and compliance
Self-administration
New patent coverage for drug formulations about to expire