A method of administering a
drug whereby a fine
drug powder can be accurately administered to a
target site (in particular, a
target site in the
body cavity) via
fluidization and spraying with a gas by using a
micro tube. Concerning the administration mode, in particular, the
drug alone or a
biopolymer is administered or the
biopolymer is employed as a carrier in the above method. More specifically speaking, a method of administering a fine
drug powder which comprises finely milling one or more types fine particles of the drug and / or the
biopolymer, blending them each other, fluidizing the blend with a gas, then transporting the fluidized matter in a
micro tube by the gas
stream and spraying the fine
drug powder from the tip of the
micro tube toward the
target site. Further, an administration method which comprises concentrically providing a capillary tube in the micro tube, supplying an
aqueous solution of the drug and / or the biopolymer from the capillary tube into the gas
stream and then mixing it with other fine particles of the drug and / or the biopolymer under transportation by the gas.