An inhalation-synchronized fluid dispenser device having a body with a mouthpiece, a fluid reservoir containing a fluid and a propellant gas mounted to slide axially in the body, a metering valve including a valve member assembled on the reservoir, an actuator element movable and/or deformable between a non-actuation position in which the metering valve cannot be actuated, and an actuation position in which the metering valve can be actuated； and an inhalation-controlled trigger system including an inhalation-sensitive member deformable and/or movable under the effect of inhaling. The inhalation-sensitive member moves and/or deforms the actuator element from its non-actuation position towards its actuation position. The actuator element is a blocking element that, in the non-actuation position, co-operates firstly with the body and secondly with the reservoir to prevent the reservoir from moving axially in the body.
