A fluid product dispenser comprising : at least one fluid product tank (1a, 1b) with an opening (11a, 11b) ; at least one fluid product dispensing member (3a, 3b) such as a pump or a valve comprising a body (31a, 31b) rigidly mounted on the tank opening and an actuation rod (32a, 32b) axially displaceable in a reciprocating manner along an X axis on a given stroke; a pusher (9) axially displaceable in a reciprocating manner along an axially displaceable in a reciprocating manner along an X axis for driving said and at least one actuation rod (32a, 32b) capable of axial displacement; characterised in that it further comprises means for modifying the stroke (8) of the actuation rod, provided between the pusher (9) and said and at least one actuation rod (32a, 32b) for modifying the stroke of the rod.