Elder person is increasing year and year,the welfare and medical care of elder person become more and more important. Elder person's general health condition is going downhill gradually, the burden and problem of elder person's medical care is increasing also. Many elder person have various chronic diseases, take one or more different medication. Beside taking medication, many elder person frequently and simultanously adminstrate other things such as health food,traditional herbs,personal secret prescritions...... This is the reason why the probability of adverse drug interaction is increasing greatly among the elder person.
