Highly Efficient Delivery of a Large Therapeutic Mass Aerosol

Abstract

A method for delivering an agent to the pulmonary system, in a single, breath-activated step or a single breath, comprises administering from a receptacle enclosing a mass of particles, to a subject's respiratory tract, particles which have a tap density of less than 0.4 g/cm 3 and deliver at least about 50% of the mass of particles. The particles are capable of carrying agents. The agent is (1) part of the spray-drying pre-mixture and thereby incorporated into the particles, (2) added to separately-prepared particles so that the agent is in chemical association with the particles or (3) blended so that the agent is mixed with, and co-delivered with the particles. Respirable compositions comprising carrier particles having a tap density of less than 0.4 g/cm 3 and a composition comprising an agent are also disclosed. Methods of delivering these respirable compositions are also included.

What is claimed is: 
     
         1 . A method of delivering levodopa to the pulmonary system, in a single, breath-activated step, comprising administering particles comprising levodopa from a receptacle having a mass consisting of said particles to a subject's respiratory tract, wherein:
 i) about 50% or more of the mass of particles stored in the receptacle is delivered to the lungs of the subject; and   ii) about 5 milligrams or more of the agent is delivered to the lungs of the subject.   
     
     
         2 . The method of  claim 1 , wherein the particles have a tap density of about 0.4 g/cm 3  or less. 
     
     
         3 . The method of  claim 1 , wherein the particles have a tap density of about 0.1 g/cm 3  or less. 
     
     
         4 . The method of  claim 2 , wherein delivery is primarily to the deep lung. 
     
     
         5 . The method of  claim 2 , wherein the particles are spray-dried particles. 
     
     
         6 . The method of  claim 1 , wherein the particles are dry powder particles. 
     
     
         7 . The method of  claim 1 , wherein at least 50% of the particles have a fine particle fraction less than 4.0 μm. 
     
     
         8 . The method of  claim 1 , wherein at least 75% of the particles have a fine particle fraction less than 6.8 μm.