An experimental technology to monitor and maintain drug levels in the body has been created by the Stanford engineers. A new technology can monitor and maintain the level of drug in the bloodstream of animals. If it works in people, it could deliver the optimal dose of life-saving drugs and prevent harmful over- or underdosing. As with coffee or alcohol, the way each person processes medication is unique. One person’s perfect dose may be another person’s deadly overdose. With such variability, it can be hard to prescribe exactly the right amount of critical drugs, such as chemotherapy or insulin.