Erythrocytes, or red blood cells, can be used as carriers for drugs and other molecules. They contain hemoglobin which gives blood its red color and allows for oxygen transport. Various methods can be used to entrap drugs inside erythrocytes, including osmotic lysis and electrical breakdown. Loaded erythrocytes undergo characterization to assess drug content, release kinetics, and effects on cell integrity. Erythrocytes show promise for targeted drug delivery to tissues like the liver and spleen, as well as for extended release of payloads over time.