Patent ID: 6874507

Claim:
A method of treatment, comprising the steps of: (a) providing a system comprising: a device for creating aerosolized particles and configured to receive a container containing a pharmaceutical formulation to be aerosolized; a plurality of groups of containers for use with the device, wherein each container within each group of containers is comprised of a porous membrane with substantially the same number and size of pores or pore sizes which is different from each of the other groups of containers; (b) over a first period of time, repeatedly using the device with a first group of containers to aerosolize the pharmaceutical formulation; and (c) over a second period of time, repeatedly using the device with a second group of containers to aerosolize the pharmaceutical formulation, wherein the number of pores or pore size in membranes of the second group of containers is different from the number of pores or pore sizes in the membranes of the first group of containers.