In various aspects of the present invention, nanoparticle compositions are provided which comprise (a) nanoparticles comprising at least one biodegradable polymer and (b) at least one pharmaceutical associated with the nanoparticles. In other aspects of the present invention, methods of forming nanoparticles compositions are provided, which comprise contacting a first liquid that comprises one or more biodegradable polymers dissolved in a first solvent with a second liquid that comprises a second solvent which is miscible with the first solvent while being a non-solvent for the one or more biodegradable polymers, such that nanoparticles are formed.
