Abstract: The present invention concerns drug delivery particles which can prevent interaction between a biologically-active cargo comprised within the particles and components of an aqueous environment in which said particles are present. The particles are sensitive to pH such that above a threshold pH level the biologically-active cargo becomes accessible to the surrounding environment. Such particles are accordingly useful for stably storing a biologically-active cargo in an aqueous composition containing components which would otherwise interact deleteriously with the cargo, and releasing the cargo to mediate a biological effect in the body of an animal, such as a human, to which the composition is administered. Also provided are compositions comprising such particles, as well as methods for making and using such particles and compositions.

Abstract: A composition to induce analgesia includes a plurality of particles, each particle of the plurality having 40-60 wt % amino amide anesthetic or a pharmaceutically acceptable salt, hydrate, or solvate thereof and 60-40 wt % PLGA polymer including 48:52 to 52:48 molar ratio D,L lactide:glycolide and an inherent viscosity of about 0.16 to 0.24 dL/g at 0.1% w/v in chloroform at 25° C. Each particle includes a non-spherical shape less than 100 ???? in a broadest dimension, and having a volume of about 13,500 cubic micrometers. The amino amide anesthetic is crystalline and includes 50-70% crystalline form I and 30-50% crystalline form II.

Abstract: Micro- and nano-particles are molded in micro- and nano-scale molds fabricated from non-wetting, low surface energy polymeric materials. The micro- and nano-particles can include pharmaceutical compositions, biologic drugs, drug compositions, organic materials, RNA, DNA, oligonucleotides, and the like.