An injection formulation may be prepared by dissolving, suspending or emulsifying an active ingredient in an aqueous solvent (e.g. distilled water, physiological saline, Linger's solution) or in an oily solvent (e.g., vegetable oil such as olive oil, sesame oil, cottonseed oil and corn oil, propylene glycol) together with a dispersant (e.g. polysorbate 80, polyoxyethylene hardened castor oil 60),