Nevertheless，overuse of drugs such as opium，central nervous system (CNS) depressants and stimulants does lead to harmful reliance in some people and is therefore becoming a serious public health concern.Although this abuse affects many people worldwide，particular trends of concern to the medical profession in the US appear among older adults，teenagers and women.

　　64.

　　Though it may be a surprise to many，the misuse of medications may be the most common form of drug abuse among the elderly.Dr Kenneth Schrader of Duke University，North Carolina states that although the elderly represent about 13% of the US population，those aged 65 and over account for the consumption of one third of all drugs.People in this age group use medications roughly three times more than the general population and have poorer compliance with instruction for use.In another study of elderly patients admitted to treatment programs,70% were women who had overused medicines.

　　65.

　　Unfortunately，this trend among women does not only affect those aged over 65.In general，among women and men who are using either an anti-anxiety drug or a sedative，women are twice as likely to become addicted.In addition，statistics compiled for 12～17 year olds show that teenage girls are more likely than teenage boys to begin overusing psychotherapeutic medication such as painkillers，tranquillizers，stimulants and sedatives.

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