Targeted Drug Delivery System Resealed Erythrocytes discusses using red blood cells (erythrocytes) as carriers for drug and enzyme delivery. Erythrocytes can be isolated from blood and loaded with drugs or enzymes using various methods like hypotonic lysis and resealing. Loaded erythrocytes can then be used to treat conditions by targeting delivery and increasing drug circulation time. New systems like nanoerythrosomes use extruded erythrocyte ghosts to produce smaller drug carrying vesicles.