A dry powder inhaler comprises two parts (2, 4) connected by an integrally molded, e.g. living hinge (6), so as to be moveable from an open position to a closed position. At least one of the parts (2, 4) defines at least part of a circulating airflow chamber (12), wherein when said parts (2, 4) are in said closed position, the inhaler comprises an airflow path including the circulating airflow chamber (12).