IntroductionSubstance abuse, defined here as the abuse of alcohol, cannabis, cocaine and heroin, in older adults is often neglected, both in science and in practice.Substance abuse is a serious public health issue as it not only affects physical and mental health of the abusers, it also leads to increased costs for society (Adams et al., 1993).Older adults with addiction problems deserve special attention.Compared to younger people, smaller amounts of substance may lead to intoxication and organ damage because of greater use of contraindicated medications, less efficient liver metabolism and decreases in lean body mass and total body water (Dufour & Fuller, 1995).Substance use and abuse among people aged 50 and over is rapidly increasing in Europe and the United States (Beynon, 2009).For Europe, the number of older people with substance use problems is estimated to more than double between 2001 and 2020 (Gossop, 2008).This is partly due to the size of the baby-boom cohort (born between 1946 and 1964) and the higher rate of substance use among this group (Gfroerer et al., 2003).Estimates from the United States suggest that the number of adults aged 50 and over will double from 2.8 million (annual average) in 2002-06 to 5.7 million in 2020 (Han et al., 2009).To reduce the negative trend in substance abuse, effective prevention is required.Cuijpers and Willemse (2005) distinguish four types of prevention in this context; universal prevention, selective prevention, indicated prevention and care based prevention.For each level of prevention, specific knowledge is needed.For universal prevention, targeted at the entire population regardless of the risk of addiction, knowledge about the prevalence, causes and adverse consequences of risk-full use are important.In selective prevention, aimed at groups at risk of becoming addicted, knowledge of risk factors is essential to identify the groups.For indicated prevention, aimed at people with limited symptoms, it is important to recognize signs of addiction and have knowledge of appropriate treatments.Finally, care based prevention, referring to people with an addiction according to DSM criteria, it is important to have insight into factors that influence the course of the disease.Insufficient knowledge of one or more levels of prevention can lead to under-recognition of addiction problems by social workers (Adams et al., 1992), lack of agreement between doctors on the causes and treatment of addiction (Brown, 1982), and people are still insufficiently aware of the importance and effects of proper treatment (McInnes & Powell, 1994). www.intechopen.comPsychiatric Disorders -Trends and Developments 390In this chapter, an overview is given of what is known about the prevalence and the biopsycho-social characteristics of older people who abuse substances.In addition, we will describe the known risk factors for the development and course of substance abuse. Methods ReviewIn addressing the aim of this chapter, three databases (PubMed, PsychINFO, and Socindex) were investigated for potentially relevant studies using the following keywords: "Alcohol", "drug abuse", "heroin", "cocaine", "cannabis", "substance abuse" each combined with AND (elderly OR older adults).Based on the title and abstract of each retrieved article the potential relevance for the current study was investigated.We selected only articles that were written in English, have appeared in peer-reviewed journals, were based on original quantitative empirical research, aiming at the older population (aged 50 years or older).Relevant information for answering the research questions was extracted from each selected article.For information on the prevalence and the bio-psycho-social characteristics of older people who abuse substances, studies containing information on one or more of the following characteristics were selected: prevalence, trends in use with age, bio-psycho-social characteristics of users, and risk-full use or addiction.For information on risk factors for the development and course of substance abuse, only longitudinal studies or case-control studies were selected.
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