The present invention provides a formulation having excellent solubility and/or stability of a polymerized drug, and more specifically, a pharmaceutical composition including a polymerized drug, a dissolution promoter and/or stabilizer, and an aqueous solvent, wherein the dissolution promoter and/or stabilizer is at least one selected from the group consisting of (1) proteins, (2) synthetic polymers, (3) sugars or sugar alcohols, (4) inorganic salts, (5) amino acids, (6) phospholipids, (7) aliphatic alcohols, (8) medium-chain fatty acids, and (9) mucopolysaccharides.
