Actuator for a breath actuated inhaler, comprising: a loading element capable of being loaded with an actuation force, a breath actuated trigger mechanism arranged to counteract the actuation force of the loading element, and to fire the actuator by releasing the actuation force of the loading element in response to an inhalation breath, and actuation locking means moveable between a locked position wherein it relieves the actuation force from the trigger mechanism setting the trigger mechanism in a neutral position, and an armed position wherein the trigger mechanism is set in an armed position, characterized in that the actuation locking means is formed as a pivotal lever with a helical cam member arranged about a pivotal point, upon movement of the locking means, after the actuator is fired, from its armed position to its locked position, the helical cam member acts on a loading yoke, initially to load the loading element with actuation force and to arm the trigger mechanism, and subsequently to overload the loading element to relieve the actuation force from the trigger mechanism upon subsequent movement of the locking means from its locked position to its armed position, the helical cam member initially acts on the loading yoke to unload the overloading force on the loading element to arm the trigger mechanism, where after it is moved to its armed position wherein the helical cam member is in a position that allows firing of the actuator, and wherein the trigger mechanism comprises: a yoke lever arranged to transform the movement of the yoke to a pivotal movement of a lock end thereof, a lock member pivotally moveable between an armed position wherein it is arranged to prevent further pivotal movement of the yoke lever lock end in the actuation direction, and an open position wherein the yoke lever is free to move beyond the armed position in the actuation direction, in the armed position the lock member is biased towards the open position by the yoke lever which in turn is biased in the actuation direction by the loading element via the yoke, a trigger element arranged for movement in response to an inhalation breath, and a release member arranged between the lock member and the trigger element to hold the lock member in the armed position, and to release the lock member in response to movement of the trigger element. a loading element capable of being loaded with an actuation force, a breath actuated trigger mechanism arranged to counteract the actuation force of the loading element, and to fire the actuator by releasing the actuation force of the loading element in response to an inhalation breath, and actuation locking means moveable between a locked position wherein it relieves the actuation force from the trigger mechanism setting the trigger mechanism in a neutral position, and an armed position wherein the trigger mechanism is set in an armed position, characterized in that the actuation locking means is formed as a pivotal lever with a helical cam member arranged about a pivotal point, upon movement of the locking means, after the actuator is fired, from its armed position to its locked position, the helical cam member acts on a loading yoke, initially to load the loading element with actuation force and to arm the trigger mechanism, and subsequently to overload the loading element to relieve the actuation force from the trigger mechanism upon subsequent movement of the locking means from its locked position to its armed position, the helical cam member initially acts on the loading yoke to unload the overloading force on the loading element to arm the trigger mechanism, where after it is moved to its armed position wherein the helical cam member is in a position that allows firing of the actuator, and wherein the trigger mechanism comprises: a yoke lever arranged to transform the movement of the yoke to a pivotal movement of a lock end thereof, a lock member pivotally moveable between an armed position wherein it is arranged to prevent further pivotal movement of the yoke lever lock end in the actuation direction, and an open position wherein the yoke lever is free to move beyond the armed position in the actuation direction, in the armed position the lock member is biased towards the open position by the yoke lever which in turn is biased in the actuation direction by the loading element via the yoke, a trigger element arranged for movement in response to an inhalation breath, and a release member arranged between the lock member and the trigger element to hold the lock member in the armed position, and to release the lock member in response to movement of the trigger element. a yoke lever arranged to transform the movement of the yoke to a pivotal movement of a lock end thereof, a lock member pivotally moveable between an armed position wherein it is arranged to prevent further pivotal movement of the yoke lever lock end in the actuation direction, and an open position wherein the yoke lever is free to move beyond the armed position in the actuation direction, in the armed position the lock member is biased towards the open position by the yoke lever which in turn is biased in the actuation direction by the loading element via the yoke, a trigger element arranged for movement in response to an inhalation breath, and a release member arranged between the lock member and the trigger element to hold the lock member in the armed position, and to release the lock member in response to movement of the trigger element.