A dry composition, comprising three-dimensional porous microparticles, wherein the microparticles comprise: (i) an active substance (eg a poorly water soluble drug), (ii) polymeric nanoparticles such as those composed of a biocompatible and/or biodegradable polymer (eg a PLGA polymer) (iii) lipid droplets (eg droplets of a medium chain triglyceride (MCT)), (iv) a nano-particle stabilising agent such as PVA or DMAB, and optionally, (v) a cryoprotectant (eg mannitol) wherein said active substance is carried by said nanoparticles and/or lipid droplets. The composition of the present invention may be formulated into, for example, a medicament for the treatment and/or prevention of various diseases or disorders (eg human or veterinary therapeutics). The average diameter of the individual microparticles of the composition, may be in the order of 2.5-3.5 μm which are particularly suitable for administration to the lung.
