A nasal spray assembly for administering a medicament to the nose of a user includes a nasal device and a container that has a reservoir containing the medicament. The reservoir is sealed by a movable piston. The nasal device includes a body, a cap that defines a socket into which the body can be inserted, an outlet, and a piercing element. The piercing element includes a piercer inlet and extends into the socket from a piercer stop within the socket. The nasal spray assembly is arranged such that, as the body is moved into the socket along a first axis, the piercing element pierces and passes through the piston such that the piercer inlet lies within the reservoir, contact between the piercer stop and piston forces the piston into the container, reducing the reservoir volume and forcing medicament from the reservoir through the conduit and out of the outlet.
