A delivery system (10) for dispensing an active substance in spray form comprises a head unit (10) including a valve (22) in communication with a dispensing nozzle (20), a first reservoir (14) containing a fluid propellant, and at least a second reservoir (16) containing the active substance. The first reservoir is engaged to the head unit in fluid flow communication with the valve, and the second reservoir is engaged to the head unit independently from the first reservoir and is in fluid flow communication with the dispensing nozzle. An actuation means (28) is operable to selectively open and close the valve. The valve, when open, permits at least the fluid propellant to flow out through the dispensing nozzle. The flow of fluid propellant entrains the active substance from the second reservoir into the fluid propellant for sprayed dispensing of the active substance from the delivery system.