The invention resides in a hand-held medicament delivery device having a housing in which is mounted, a switch, an electro-mechanical drug delivery mechanism activatable by the switch and a dose button associated with the switch. When the dose button is pressed by a user, the switch is activated. Furthermore, the dose button is hinged along one edge thereof. The dose button may be hinged about a support element of the housing or integrally formed with at least a part of the housing, a line of weakness such as a thin walled region being provided between the housing and the dose button to serve as the hinge.
