A medicament delivery device for the administration of one or more drug agents is described. The device has a priming mode and a drug delivery mode for administering delivery of the drug agents. The device includes a controller operative for controlling the device to perform a priming operation, and a user interface for activation of the priming operation. The controller is operative to perform the priming operation by way of a plurality of intermittent doses of medicament, the number of intermittent doses being dependent on the activation of the user interface.
