1. Treatments of diseases that work in harmony with the body's natural time rhythms: One cure regarding chronotherapy relates to drugs given to patients at the optimum time in their day cycle of the cell growth of the illness.
2. The coordination of biological rhythms (chronobiology) with medical treatment: Chronotherapy includes a person's biological rhythms in determining the timing and sometimes the amount of medication in order to optimize a drug's desired effects and to minimize the undesired ones.