When a patient, particularly the elderly is prescribed frequently to take more than one therapeutic agent, drug interactions resulting in toxicity will occur.
病人(特别是老年病人)经常性使用一种以上治疗药物的话，往往会发生产生毒性药物的相互作用。
2
When a patient, particularly the elderly is prescribed frequently to take more than one therapeutic agent, drug interactions resulting in toxicity will occur.
Because of the asymmetric information problem, the principal (patient) is unable and without incentive to supervise the agent 's (doctor's) activities from begiming to end.