A refill assembly for use in a medicinal inhaler, the refill assembly being configured to be removably coupled to a reusable assembly of a medicinal inhaler, the refill assembly comprising: a patient port； a canister actuable by the reusable assembly to deliver a dose of medicament to the patient port, a sleeve which is selectively actuable by a user independently of the reusable assembly so as to act on the canister to deliver a dose of medicament, the sleeve having a first position in which the sleeve cannot be actuated to cause a dose of medicament to be released from the canister and a second position in which the sleeve is actuable to cause a dose of medicament to be delivered to the patient port； the refill assembly further comprising: an override element which engages the sleeve, the override element being moveable from a first position in which the sleeve is retained in its first position by the override element and a second position in which the sleeve is permitted to move to its second position upon depression of the sleeve by a user.
