An add-on holding chamber for an inhaler mixer system has a holding chamber, mouthpiece, and attachment interface is coupled to the mouth inlet of the prior art inhaler, to provide a better mixing efficiency. The chemical from the medicament canister is sprayed into the air inlet side of the prior art inhaler, which enters the holding chamber, and as the user sucks onto the mouthpiece of the add-on holding chamber, air flows into the holding chamber (via inlets in the holding chamber which operate to move more air and/or vortex additional air) towards the air inlet side of the prior art inhaler. The added inhaled air provides more air and force to aerosolize with more efficiency the chemical/air mixture in the holding chamber.
