| abstract |
The present invention provides a novel tool for designing a release profile of an active agent from a liposome in to which it is loaded. According to the invention, a method is provided for preparing a liposomal formulation for delivery of an active agent to a target, the release of said active agent from the liposome being designed to have a release profile in which the release is sustained for a time period to achieve an optimal effect of the active agent at said target, the method comprising preparing a liposomal formulation, wherein the liposome is loaded with said active agent and with a selected counter ion, the counter ion and the active agent interacting together to aggregate and/or to form a precipitate within the liposome, the counter ion being selected such that the release of the active agent from the liposome has said release profile. |