Drug into unilamellar and multilamellar vesicles and complexation of drug with lipids have been devised for intravascular administration. Semisolid phospholipid dispersion of vesicular morphology, termed as vesicular phospholipid gels, is another approach in liposomal technology. Examples for vesicular phospholipid gels formulations are erythropoietin protein and cetrorelix peptide.