An injection device for injecting a solid dose formulation into a human or animal body, the injection device comprising an actuator (10) having a cassette mounting portion (14)； a cassette holder (20) having a cassette storage portion； and a cassette selectively movable between the cassette storage portion and the cassette mounting portion, wherein, the cassette (34) comprises a solid dose formulation and the actuator is receivable in the cassette holder to selectively move the cassette between the cassette storage portion and the cassette mounting portion.
