A cochleate composition is disclosed. Following oral administration of the cochleate composition, the pharmacologically active agent is found at higher concentrations in the tissue relative to plasma. Oral administration of these cochleate compositions also preferentially targets infected or inflamed tissue as compared to tissue in a healthy subject. The cochleate composition contains a size-regulating agent that reduces cochleate particle size, such as a lipid-anchored polynucleotide, a lipid-anchored sugar, a lipid-anchored polypeptide, or a bile salt (such as oxycholate or deoxycholate). Also disclosed are methods of treatment using the cochleate composition and methods of increasing the concentration of a pharmacologically active agent in an infected tissue relative to the concentration of the pharmacologically active agent in the plasma or the tissue of a healthy subject.
