Examples of polar solvents include, but are not limited to, glycols such as glycerin, alcohols (e.g., those alcohols having from about 2 carbon atoms to about 6 carbon atoms), propylene glycol, sorbitol, oxyalkylene polymers such as PEG 4, and derivatives thereof. [0052] The liposomes of the present invention may be included within pharmaceutical (e.g., compounded with a pharmaceutically compatibl