ABSTRACT
Since the formulation does not have to be miscible with water, it is possible to inject a much wider range of materials than those which can be administered intravenously. The possible formulations include aqueous solutions, aqueous suspensions, oily solutions, oil in water emulsions, water in oil emulsions, oily suspensions, and dispersions in polymer or solid implants. These are listed approximately in order of release rate, as aqueous solutions can be absorbed in minutes, while implants can deliver drugs for several months.
