A pressurised metered dose inhaler comprising:- (a) a housing in which a container unit, containing a medicament formulation, is received and is relatively movable to cause dispensing of a dose of the medicament formulation for inhalation by a user through a dispensing outlet of the housing, wherein: (i) the container unit is a dispensing container unit having first and second parts which are movable relative to one another, said relative movement causing dispensing of the dose of the medicament formulation from the dispensing container unit; (ii) the second part is a pressurised container member (14a,14b) containing therein the medicament formulation under pressure; (iii)the first part is a valve stem of a metering valve for releasing a metered dose of the pressurised medicament formulation from the dispensing container unit upon relative movement between the pressurised container member and the valve stem; and (iv)the housing has a stem block supporting the first part of the dispensing container unit in a stationary position relative to the housing so that, in use, the second part is able to move in the housing relative to the first part to dispense the dose of the medicament formulation; (b) a closure positionable to close the dispensing outlet; and (c) a restricting member, provided on the closure, movable between a first position which enables the movement of the second part of the container unit relative to the first part for dispensing of the dose of the medicament formulation, and a second position in which the restricting member restricts the movement of the second part of the container unit relative to the first part such that dispensing of the dose of the medicament formulation is prevented; wherein when the closure is positioned to close the dispensing outlet the restricting member enters the housing through the dispensing outlet to be disposed in its second position; characterised in that the restricting member is configured as a clip which, in its second position, detachably engages a step in the housing and/or the stem block to retain the restricting member in its second position. (a) a housing in which a container unit, containing a medicament formulation, is received and is relatively movable to cause dispensing of a dose of the medicament formulation for inhalation by a user through a dispensing outlet of the housing, wherein: (i) the container unit is a dispensing container unit having first and second parts which are movable relative to one another, said relative movement causing dispensing of the dose of the medicament formulation from the dispensing container unit; (ii) the second part is a pressurised container member (14a,14b) containing therein the medicament formulation under pressure; (iii)the first part is a valve stem of a metering valve for releasing a metered dose of the pressurised medicament formulation from the dispensing container unit upon relative movement between the pressurised container member and the valve stem; and (iv)the housing has a stem block supporting the first part of the dispensing container unit in a stationary position relative to the housing so that, in use, the second part is able to move in the housing relative to the first part to dispense the dose of the medicament formulation; (i) the container unit is a dispensing container unit having first and second parts which are movable relative to one another, said relative movement causing dispensing of the dose of the medicament formulation from the dispensing container unit; (ii) the second part is a pressurised container member (14a,14b) containing therein the medicament formulation under pressure; (iii)the first part is a valve stem of a metering valve for releasing a metered dose of the pressurised medicament formulation from the dispensing container unit upon relative movement between the pressurised container member and the valve stem; and (iv)the housing has a stem block supporting the first part of the dispensing container unit in a stationary position relative to the housing so that, in use, the second part is able to move in the housing relative to the first part to dispense the dose of the medicament formulation; (b) a closure positionable to close the dispensing outlet; and (c) a restricting member, provided on the closure, movable between a first position which enables the movement of the second part of the container unit relative to the first part for dispensing of the dose of the medicament formulation, and a second position in which the restricting member restricts the movement of the second part of the container unit relative to the first part such that dispensing of the dose of the medicament formulation is prevented; wherein when the closure is positioned to close the dispensing outlet the restricting member enters the housing through the dispensing outlet to be disposed in its second position;