Erythrocyte-based drug delivery
Erythrocyte-based drug delivery systems (EBDDS) use red blood cells, their membranes, or their components to release and deliver pharmaceutical agents throughout the body in a controlled manner. Because red blood cells circulate for long periods of time and are potentially non-immunogenic, they are an attractive vector for drug delivery via the circulatory system.
Source: Wikipedia — Erythrocyte-based drug delivery (CC BY-SA 4.0)