LIPOSOMES COMPRISING AMPHIPATHIC DRUGS AND METHOD FOR THEIR PREPARATION

摘要

The present invention provides a liposome having co-encapsulated in its intraliposomal aqueous core at least two amphipathic drugs, the liposomes being characterized by one of the following: the amphipathic drugs are co-encapsulated at a pre-determined ratio; the liposome comprises one or a combination of liposome forming lipids have a solid ordered to liquid disordered phase transition temperature above 37°C; each of the amphipathic drugs exhibit a liposomal profile that corresponds to the profile of each drug when encapsulated as a single drug in the same liposome; and the liposome is absent of one or both of a transition metal and a ionophore. The invention also provides a method for preparing such liposomes. This method, taken together with the features of the liposomal composition, provides high loading and long term stability of the resulting co-encapsulated liposomal formulation.