The invention features a method of administering one or more therapeutic agents to a patient and delivering said agent or agents continuously over an extended period of time, said method comprising: obtaining a pharmaceutical composition including a peptide carrier, one or more therapeutic agents, and up to 30 percent, by weight, of a pharmaceutically acceptable, soluble, monomeric carrier; and parenterally administering said pharmaceutical composition to a subject by injection, wherein said composition automatically forms a gel after interaction with the patient's bodily fluids and releases said peptide carrier and said agent or agents continuously within the patient over an extended period.