Drug therapy as a method to combat addiction

Drug therapy is a biological approach used to address addictions, particularly to substances like drugs and alcohol. It focuses on gradually reducing dependency through detoxification and the use of specific medications to manage withdrawal and prevent reinforcement of addictive behaviours.

Approaches and medications in drug therapy

• Gradual detoxification - The amount of the addictive substance is slowly decreased over time to minimise withdrawal effects, often supported by prescribed medications.
• Use of agonists - These drugs bind to cell receptors and mimic the effects of the addictive substance in a less harmful way, helping to ease withdrawal symptoms.
  • For instance, methadone is often used for heroin addiction. It activates opiate receptors to calm the nervous system, offering a safer alternative to heroin. Studies, such as one by Newman and Whitehill (1979), showed methadone to be more effective than a placebo in helping heroin addicts reduce their dependency.
• Use of antagonists - These drugs block receptors to prevent the pleasurable effects of the addictive substance, breaking the cycle of reinforcement.
  • For example, naltrexone is used for heroin and alcohol addiction. It inhibits brain pathways that transmit pleasure, ensuring the substance no longer feels rewarding, thus reducing the desire to use it.
• Risk of side effects - Medications used in drug therapy can cause unwanted side effects, which must be monitored to ensure they do not harm the individual.
• Risk of relapse - The effectiveness of drug therapy often depends on continued use of the medication. Stopping treatment can lead to a return to addictive behaviour.

Behavioural interventions for reducing addictive behaviour

Behavioural interventions aim to break addictions by creating negative associations with the addictive behaviour, encouraging individuals to avoid the substance or action through unpleasant consequences or mental imagery.

Types and effectiveness of behavioural interventions

• Aversion therapy with medication - This method pairs the addictive behaviour with an unpleasant physical reaction.
  • For example, a drug like disulfiram (commonly known as Antabuse®) is prescribed to individuals with alcohol addiction.
  • When combined with alcohol, it causes nausea, creating a strong negative association with drinking.
  • Research by Meyer and Chesser (1970) found that approximately 50% of participants using disulfiram remained abstinent for over a year, compared to a much lower rate in a control group without the drug.
• Covert sensitisation - This technique uses imagination to form negative associations without physical stimuli.
  • Individuals visualise distressing scenarios, such as becoming violently ill, while thinking about their addictive behaviour, like craving alcohol.
  • A study by Kraft and Kraft (2005) involving six participants with various addictions (including smoking and overeating) found covert sensitisation effective after just 2-4 sessions, though the small sample size limits broader application.
• Ethical concerns - Aversion therapy raises ethical questions due to the deliberate use of unpleasant stimuli, which can cause distress.
• Compliance challenges - Success often depends on individuals continuing the treatment long enough to form lasting associations. Some may stop taking medications like disulfiram to resume their addictive behaviour.

Cognitive behaviour therapy (CBT) and its role in addiction treatment

Cognitive behaviour therapy (CBT) focuses on altering addictive behaviours by transforming the thought patterns that drive them. It addresses underlying beliefs and attitudes to foster healthier responses to triggers.

Principles and effectiveness of CBT in addiction treatment

• Cognitive restructuring - CBT identifies and challenges harmful thoughts, such as "I can't function without this substance," replacing them with constructive alternatives to reduce dependency.
• Evidence of success - CBT has shown positive results, particularly in enhancing other treatments like nicotine replacement therapy for smoking cessation.
• Supporting research - Carroll et al. (1994) compared two groups of individuals addicted to cocaine. One group received CBT sessions, while the other underwent a different form of therapy. Both groups saw reduced emotional distress, but the CBT group showed more success in stopping the addiction, with sustained results at a follow-up after one year.
• Limitations of CBT - Several challenges can affect its effectiveness:
  • Time commitment - The process can be lengthy, requiring significant dedication from the individual.
  • Need for motivation - Changing ingrained thought patterns is difficult, so individuals must be highly committed to the therapy.
  • Cognitive demands - CBT requires focus and clear thinking, which can be challenging for those still struggling with substance use without prior support or detoxification.

The theory of planned behaviour and its application to behaviour change

The theory of planned behaviour (TPB) is a psychological model used to predict and influence behaviour change, including in the context of addiction. It builds on earlier concepts to explain how intentions shape actions.

Core components of the theory of planned behaviour

• Origins in the theory of reasoned action (TRA) - Developed by Fishbein and Ajzen in 1975, TRA suggests that behaviour, such as quitting smoking, is driven by intention, which is influenced by:
  • Attitude towards the behaviour - Based on beliefs about outcomes (e.g., "Quitting will improve my health") and whether these are seen as positive or negative.
  • Subjective norms - Perceptions of social expectations (e.g., "My family wants me to stop") and the motivation to meet these expectations.
• Extension to TPB - Ajzen (1991) added perceived behavioural control, which reflects an individual's belief in their ability to change (e.g., "I have the strength to quit"). This factor impacts behaviour both indirectly (by affecting intention) and directly (if the belief in control is accurate).
• Predictive strength - A meta-analysis by Sheppard et al (1988) found TRA and TPB effective in predicting intentions and behaviours, making them useful for designing interventions. However, they overlook emotional factors and habits that can influence actions.
• Application to addiction - Research by Norman et al (1999) showed perceived behavioural control as a key predictor of binge-drinking. Interventions can use TPB to boost individuals' confidence in controlling their addictive behaviours.

Both TRA and TPB may not fully account for the irrational nature of addictive behaviours, where actions often contradict stated intentions or logical decision-making.

Prochaska's six-stage model of behaviour change

Prochaska and DiClemente (1983) developed a six-stage model to describe the process of changing behaviour, particularly in the context of addiction. It outlines the journey from denial to sustained change, acknowledging that progress is personal and non-linear.

Stages and support strategies in Prochaska's model

1. Precontemplation - The individual does not recognise their addiction as a problem and rationalises their behaviour. Concern is expressed by others, and discussions about the issue are encouraged.
2. Contemplation - The individual begins to see their addiction as a problem but is not yet ready to act. They are prompted to evaluate the benefits and drawbacks of their addiction versus change.
3. Preparation - The individual acknowledges the problem and commits to change, setting goals and plans. Support is given to take initial steps towards transformation.
4. Action - Active efforts are made to change behaviour, with lifestyle adjustments and a clear plan. Assistance and social support are provided to aid the changes.
5. Maintenance - Focus is on sustaining new behaviours and preventing a return to addiction. Ongoing encouragement is offered to avoid relapse.
6. Relapse - The individual returns to the addictive behaviour after a period of abstinence. Relapse is framed as a learning experience, with analysis of triggers and prevention strategies.

This model has been effectively applied to various addictions, including smoking, alcohol use, and drug dependency, highlighting the importance of tailored support at each stage to facilitate lasting change.