An inhaler comprising a first and second body member, the first body member and the second body member fitting closely together to form an inhaler body, and an outlet. The first body member includes a medicament chamber containing a unit dose of powdered medicament and a foil that closes the medicament chamber extending outwardly of the inhaler body to be grasped and withdrawn, thereby releasing the powdered medicament from the medicament chamber. The second body member includes a medicament collection well in which the released medicament is collected. The medicament collection well forms part of an airway communicating with the outlet, allowing inhalation air to entrain medicament in the medicament collection well. In another embodiment, the inhaler body includes a dispersion chamber. There is also disclosed a dry powder for inhalation comprising a desiccant and a bioactive agent, and a method of delivering a medicament to a patient.