An inhaler comprising a tubular body (1) defining a tubular air flow passage with a bendable section, preferably a U-shaped section comprising peripherally extending corrugations and means for supplying a dose of at least one active inhalable, particulate substance into the flow passage and a cap (2). According to the invention the dose of the at least one active, inhalable particulate substance is placed in the cap (2) to be released from said cap substantially at the beginning of the corrugations in the intake direction.
