Recent developments in nasal delivery systems has resulted in greater focus on different uses for drug delivery. With great potential for rapid drug absorption into the turbinates and lymphoid tissues located at the back of the nasal cavity, focus has shifted to absorption into the systemic circulation and central nervous system for a wider range of treatments. There are three conventional technologies for nasal delivery: metered spray pumps (aqueous-based), nasal aerosols (propellant-based) and powder-based.