A medicament dispenser, comprising: a first side surface; a second side surface 16) spaced from and substantially opposed to the first side surface; a medicament packaging structure located between the first side surface and second side surface; a pivot structure extending between the first side surface and the second side surface, wherein the medicament packaging structure is rotatable about the pivot structure from an enclosed state in which the medicament packaging structure is substantially enclosed by the first side surface and second side surface to an exposed state in which the medicament packaging structure is substantially exposed from at least one of the first side surface and second side surface; and a primary lock structure located adjacent the first side surface and second side surface and configured to rotate with respect to the first side surface and second side surface between a locked state in which the primary lock structure prevents rotation of the medicament packaging structure and an unlocked state in which rotation of the medicament packaging structure is not prevented by the primary lock structure; characterised in that the first side surface includes a first lock-receiving portion that is relatively more flexible with respect to a remainder portion of the first side surface and includes a mating structure that interlocks with a respective mating structure on the primary lock structure when in the locked state, and the second side surface includes a second lock-receiving portion that is relatively more flexible with respect to a remainder portion of the second side surface and includes a second mating structure that interlocks with a respective second mating structure on the primary lock structure when in the locked state. a first side surface; a second side surface 16) spaced from and substantially opposed to the first side surface; a medicament packaging structure located between the first side surface and second side surface; a pivot structure extending between the first side surface and the second side surface, wherein the medicament packaging structure is rotatable about the pivot structure from an enclosed state in which the medicament packaging structure is substantially enclosed by the first side surface and second side surface to an exposed state in which the medicament packaging structure is substantially exposed from at least one of the first side surface and second side surface; and a primary lock structure located adjacent the first side surface and second side surface and configured to rotate with respect to the first side surface and second side surface between a locked state in which the primary lock structure prevents rotation of the medicament packaging structure and an unlocked state in which rotation of the medicament packaging structure is not prevented by the primary lock structure; characterised in that the first side surface includes a first lock-receiving portion that is relatively more flexible with respect to a remainder portion of the first side surface and includes a mating structure that interlocks with a respective mating structure on the primary lock structure when in the locked state, and the second side surface includes a second lock-receiving portion that is relatively more flexible with respect to a remainder portion of the second side surface and includes a second mating structure that interlocks with a respective second mating structure on the primary lock structure when in the locked state.