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There are two main types of ‘substance use disorders': substance misuse and substance dependence. A substance may be a legal drug, an illegal drug, a prescribed drug (medicine given out by a doctor), or a toxin (poison).
Substance misuse describes when a person experiences harmful or negative consequences when repeatedly taking a substance. These consequences can range from mild (e.g. headache) to severe (e.g. legal problems because of the substance). It is the severe consequences that can lead to someone having a substance misuse problem. It is important to note that the diagnostic guidelines use the term substance ‘abuse' when talking about people who have a substance misuse problem, but most health professionals now prefer the word ‘misuse'.
Substance dependence describes when a person continues to take a substance over a long period of time even though the behaviour is causing them serious problems. The person will experience a range of cognitive (mental processes), behavioural, and physiological (body) symptoms. They may also build up a tolerance for the substance (need to use more of the substance to get the same effects), and could also experience withdrawal symptoms when the substance is not taken regularly. Withdrawal symptoms are the unpleasant physical and mental effects that occur when the amount of substance in the body begins to drop. Most people who have a substance dependence problem also have a substance misuse problem.
There are many different substances and they can each affect the mind and body in different ways. The types of substances a person may misuse and/or become dependent on, include:
People can misuse and/or become dependent on more than one substance.
Many people use substances without developing a substance use disorder, but there are a small number of people who will misuse and/or become dependent on a substance or substances. Some signs that a person may have a substance use disorder include:
A diagnosis of substance use disorder can only be made by a qualified and trained health professional, such as a psychiatrist. The diagnosis is based on the person meeting a strict set of criteria (meaning that the person using the substance(s) must experience a certain number of signs/symptoms for a certain length of time). It's important to remember that there will always be people who show some signs of a substance use disorder, but do not meet the diagnostic criteria; they should also be offered help and support.
There is no single reason why people misuse and/or become dependent on substances, but there are factors that can increase the likelihood of a person developing a substance misuse or dependence problem. These factors include:
having a sensitivity to drugs (react easily to a drug or drugs).
Substance use disorders can often occur with other mental illnesses, such as depression. The occurrence of two mental illnesses at the same time is called comorbidity. There are a number of reasons why comorbidity may occur:
Sometimes the effects a substance has on the mind and body are similar to the signs of mental illness. This can make it hard to recognise other mental illnesses in people with substance use disorders. Many types of substances have been linked with mental illnesses, such as:
volatile substance misuse/dependence and personality disorders.
It is helpful to look at how common substance use is among Aboriginal and Torres Strait Islander people and non-Indigenous people before looking at how many people experience substance use disorders. Information from the 2008 National Aboriginal and Torres Strait Islander Social Survey showed that Aboriginal and Torres Strait Islander people are less likely to drink alcohol than are non-Indigenous people, but those Aboriginal and Torres Strait Islander people who do drink alcohol, are more likely than non-Indigenous people to do so at harmful levels.
The survey also reported that almost one-quarter of Aboriginal and Torres Strait Islander people aged 15 years or over had used an illicit substance in the previous 12 months. This was more than one-and-a-half times the amount reported by non-Indigenous people in a similar survey.
Alcohol and tobacco are the most commonly used substances among Aboriginal and Torres Strait Islander people followed by:
Information on how many Aboriginal and Torres Strait Islander people have been diagnosed with a substance use disorder is not available, but information from 2008-09 shows more Aboriginal and Torres Strait Islanders were hospitalised for substance use disorders than any other type of mental and behavioural disorder. Aboriginal and Torres Strait Islander people were nearly four times more likely to be hospitalised for substance use disorders than non-Indigenous people.
Substance use disorders must be taken seriously and it is important that health workers don't react in a negative way to someone they think has a substance misuse and/or dependence problem. It is common for people with substance use disorders or other types of mental illness to not want to talk about the problem. To encourage people to get help, it is important to remind them that substance use disorders and other mental illnesses are health problems just like any other illness and that they have the right to seek treatment without blame.
Examples of how you can help someone with a substance misuse and/or dependence problem includes encouraging them to:
Dealing with substance use disorders requires a long-term approach. It begins with a solid practitioner-client relationship that is based on honesty, trust, and respect. It is important that the client's treatment preferences and readiness to change are taken into account when developing a treatment plan. For clients with substance use disorders and other mental illnesses, the treatment may focus on one or both of the illnesses and may include psychosocial interventions, medication, or a combination of both.
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