A drug dispensing device for repetitive dispensing on inhalation of a drug released from a pressurised drug source with a can body and a delivery stem, the dispenser comprising: • a hollow body having: ∘ a wall enclosing a breath passage within the hollow body, ∘ an ambient opening to the breath passage, ∘ a patient breathing opening to the breath passage, ∘ a can receptor attached to the hollow body for accommodating the can body of the pressurised drug source, ∘ a junction member attached to the hollow body for connection with the delivery stem of the pressurised drug source and leading delivered drug from the delivery stem, • a drug disperser for dispersing the delivered drug towards the patient breathing opening, • a drug duct from the junction member to the drug disperser, • a single valve in the drug path from the delivery stem to the disperser, and • a valve actuator operatively connected to the valve and including a breath detection member arranged in the breath passage to be acted on by breath passing therethrough and a means for closing the valve a predetermined time after its opening on inhalation, the valve and the actuator being so arranged that: • on inhalation, with the breath detection member detecting such, the valve is opened to release a predetermined dose of drug during the predetermined period under pressure from the drug source through a downstream portion of the drug duct and to disperse from the drug disperser in the patient breathing opening; the arrangement permitting a small dose of the drug to be repetitively released on each breath by the patient. • a hollow body having: ∘ a wall enclosing a breath passage within the hollow body, ∘ an ambient opening to the breath passage, ∘ a patient breathing opening to the breath passage, ∘ a can receptor attached to the hollow body for accommodating the can body of the pressurised drug source, ∘ a junction member attached to the hollow body for connection with the delivery stem of the pressurised drug source and leading delivered drug from the delivery stem, ∘ a wall enclosing a breath passage within the hollow body, ∘ an ambient opening to the breath passage, ∘ a patient breathing opening to the breath passage, ∘ a can receptor attached to the hollow body for accommodating the can body of the pressurised drug source, ∘ a junction member attached to the hollow body for connection with the delivery stem of the pressurised drug source and leading delivered drug from the delivery stem, • a drug disperser for dispersing the delivered drug towards the patient breathing opening, • a drug duct from the junction member to the drug disperser, • a single valve in the drug path from the delivery stem to the disperser, and • a valve actuator operatively connected to the valve and including a breath detection member arranged in the breath passage to be acted on by breath passing therethrough and a means for closing the valve a predetermined time after its opening on inhalation, • on inhalation, with the breath detection member detecting such, the valve is opened to release a predetermined dose of drug during the predetermined period under pressure from the drug source through a downstream portion of the drug duct and to disperse from the drug disperser in the patient breathing opening;