Method for the prevention of undesired emission of medically active liquid or aerosol from an inhalation device, the inhalation device comprising a housing , inside this housing a reservoir for storing a liquid (F), a pumping device with a pumping chamber for generation of a pressure inside said pumping chamber , wherein the pumping chamber is fluidically connected with the reservoir , a riser pipe which is received with at least one reservoir-facing, interior end in said pumping chamber , and a nozzle which is connected liquid-tight to an exterior end of the riser pipe , wherein the interior volume of the pumping chamber is changeable by means of linear relative motion of the pumping chamber to the riser pipe , wherein said linear relative motion is effected by a relative rotation of a rotatable part which is part of or connected to the housing with respect to a second part of said housing , and wherein a means for the storage of potential energy is provided which is loaded by means of said relative rotation, and which releases said energy to said pumping mechanism when released by activating a release means, characterized in that (i) activating of the release means and/or release of the means for the storage of potential energy during rotating the rotatable part , or during loading of the means for the storage of potential energy , is blocked, and/or (ii) loading of the means for the storage of potential energy and/or rotating the rotatable part is blocked when the release means is activated. the inhalation device comprising a housing , inside this housing a reservoir for storing a liquid (F), a pumping device with a pumping chamber for generation of a pressure inside said pumping chamber , wherein the pumping chamber is fluidically connected with the reservoir , a riser pipe which is received with at least one reservoir-facing, interior end in said pumping chamber , and a nozzle which is connected liquid-tight to an exterior end of the riser pipe , wherein the interior volume of the pumping chamber is changeable by means of linear relative motion of the pumping chamber to the riser pipe , wherein said linear relative motion is effected by a relative rotation of a rotatable part which is part of or connected to the housing with respect to a second part of said housing , and wherein a means for the storage of potential energy is provided which is loaded by means of said relative rotation, and which releases said energy to said pumping mechanism when released by activating a release means, characterized in that (i) activating of the release means and/or release of the means for the storage of potential energy during rotating the rotatable part , or during loading of the means for the storage of potential energy , is blocked, and/or (ii) loading of the means for the storage of potential energy and/or rotating the rotatable part is blocked when the release means is activated. (i) activating of the release means and/or release of the means for the storage of potential energy during rotating the rotatable part , or during loading of the means for the storage of potential energy , is blocked, and/or (ii) loading of the means for the storage of potential energy and/or rotating the rotatable part is blocked when the release means is activated. <EOS>