AQA Syllabus focus:
'Reducing addiction, including drug therapy as a biological intervention.'
Drug therapy reduces addiction by altering body and brain processes that maintain dependence. It can lower withdrawal symptoms, reduce craving, and make relapse less rewarding, so it is treated as a biological intervention.
Drug therapy as a biological intervention
Drug therapy uses medication to help a person stop, reduce, or control an addictive behavior. In addiction, the main biological target is usually the brain’s reward system or the physical symptoms that appear when the substance is removed.
Drug therapy: The use of medication to reduce addiction by changing biological processes such as withdrawal, craving, or the reinforcing effects of an addictive substance.
This approach is based on the idea that addiction is partly maintained by physical dependence and by neurochemical changes linked to repeated substance use. If medication weakens these processes, the person may find it easier to cut down, detox, or remain abstinent.
Drug therapy does not always aim for immediate abstinence. In some cases, the goal is harm reduction, meaning the medication lowers danger and stabilizes behavior before complete withdrawal is attempted.
How drug therapy works
Drug therapies reduce addiction in several main ways:
Substituting the addictive drug with a safer or slower-acting medication
Reducing withdrawal symptoms, making detox more manageable
Lowering craving, which can reduce relapse risk
Blocking rewarding effects, so taking the substance produces less pleasure
Creating unpleasant reactions if the person uses the substance again
Substitute and maintenance drugs
One common approach is to prescribe a drug that acts in a similar way to the addictive substance but in a more controlled form. For example, methadone may be used for opioid addiction, and nicotine replacement therapy may be used for nicotine addiction.
These medications are useful because they:
give a measured dose
are usually longer acting
avoid the sharp “high” linked with abuse
can be reduced gradually under supervision
This makes withdrawal less severe and can help a person function more normally while reducing risky behavior associated with uncontrolled drug use. For some individuals, substitute medication is used short term for detoxification; for others, it is used longer term as maintenance treatment.
Detoxification: The medically managed process of removing or reducing an addictive substance from the body while minimizing withdrawal symptoms.
Detoxification can be physically demanding, so medication may be important in the early stage of recovery, especially when sudden withdrawal would be distressing or dangerous.
Antagonist drugs
Another approach is to use medication that blocks the effects of the addictive substance. Naltrexone, for example, can be used in opioid or alcohol treatment.
Antagonist: A drug that blocks receptor sites, preventing another substance from producing its usual effect.
If the person uses the addictive substance while taking an antagonist, the expected pleasurable effect is reduced or absent. This weakens the rewarding value of the drug and can make relapse less satisfying. Antagonist drugs are especially useful once detoxification has already occurred, because they are not designed to replace the drug; they are designed to stop it from working normally.
Aversive and relapse-prevention medication
Some medications reduce addiction by making substance use unpleasant or by lowering the biological drive to return to use. Disulfiram, used with alcohol addiction, can trigger nausea, vomiting, or headaches if alcohol is consumed. This creates a strong negative association with drinking.
Other medications, such as acamprosate for alcohol dependence, are used to reduce craving and support abstinence after withdrawal. In both cases, the aim is to make relapse less likely by changing the biological consequences of use or non-use.
Strengths of drug therapy
Drug therapy has several important strengths:
It can act quickly, especially when severe withdrawal symptoms are present.
It directly targets biological mechanisms involved in addiction, which matches the idea that dependence has a physical basis.
It can improve treatment retention because people are more likely to stay in treatment if craving and withdrawal are reduced.
It is often standardized: dosage, timing, and monitoring can be controlled by medical professionals.
There is research support for many forms of medication-assisted treatment. For example, nicotine replacement increases quit rates compared with no medication, and opioid substitute drugs can reduce illicit use and related harm.
These strengths mean drug therapy can be especially useful when addiction is long-standing, physically risky, or associated with repeated relapse.
Limitations and issues
Despite its value, drug therapy is not a complete solution.
It may treat the symptoms of addiction more effectively than the wider causes. A person may still return to addictive behavior if triggers, stress, or lifestyle patterns remain unchanged.
Some treatments depend heavily on adherence. If medication is not taken regularly, its protective effect may disappear.
Drugs can cause side effects, such as nausea, sleep problems, mood changes, constipation, or sedation. These can reduce willingness to continue treatment.
Substitute drugs can themselves produce dependence. For example, methadone is generally safer than heroin, but it may still create physical dependence.
Aversive drugs only work well if the person is motivated enough to keep taking them. If they stop the medication, the deterrent is removed.
Access can be limited by cost, availability of trained prescribers, or the need for ongoing medical supervision.
Some critics argue that maintenance prescribing replaces one drug with another. Supporters respond that the replacement drug is safer, legal, and medically controlled, so overall harm is reduced.
Because of these limits, the effectiveness of drug therapy often depends on careful prescribing, monitoring, and the person’s motivation to remain in treatment.
Practice Questions
Outline one way drug therapy can reduce addiction. (2 marks)
1 mark for identifying a valid way, such as reducing withdrawal, lowering craving, blocking rewarding effects, creating unpleasant effects, or using a substitute drug.
1 mark for elaboration linked to addiction reduction, for example “methadone replaces heroin in a controlled dose so withdrawal is reduced” or “naltrexone blocks receptors so relapse is less rewarding.”
Discuss drug therapy as a biological intervention for reducing addiction. (6 marks)
AO1 up to 3 marks:
Drug therapy uses medication to change biological processes involved in addiction.
It may reduce withdrawal symptoms or craving.
It may substitute a safer drug, block the effects of the addictive substance, or create unpleasant consequences after use.
Credit relevant examples such as methadone, nicotine replacement, naltrexone, disulfiram, or acamprosate.
AO3 up to 3 marks:
Strengths such as quick action, research support, standardized treatment, and harm reduction.
Limitations such as side effects, adherence problems, possible dependence on substitute drugs, and failure to address wider causes of addiction.
Credit clear, developed discussion rather than simple listing.
FAQ
The choice depends on risk, stability, and treatment goals.
Maintenance medication is more likely when relapse risk is high, withdrawal is severe, or the person needs time to stabilize housing, health, or daily functioning.
Detoxification is more likely when the person is medically ready to withdraw and has enough support to manage the early abstinence period.
Clinicians also consider overdose history, previous failed detox attempts, and whether abrupt withdrawal could be dangerous.
If opioids are still active in the body, an antagonist can quickly displace them from receptor sites.
That causes a sharp drop in opioid effects, which can produce precipitated withdrawal. Symptoms may include sweating, nausea, pain, agitation, and vomiting.
Because of this risk, clinicians usually wait until detox has begun and the person is opioid-free enough for the medication to be used safely.
They usually produce more stable drug levels in the body.
This matters because a slow, steady release is less likely to create the rapid “rush” that can itself become reinforcing.
These forms can also improve convenience:
patches give background coverage across the day
gums or lozenges can help with sudden cravings
slow-release tablets reduce frequent dosing
The aim is to support control rather than recreate the addictive pattern.
Not always. Some medications can be stopped more easily than others, but sudden stopping may cause rebound symptoms, renewed craving, or a rise in relapse risk.
For substitute medications in particular, tapering is often safer than abrupt discontinuation.
A clinician will usually consider:
current dose
how long the medication has been used
side effects
relapse history
physical health
Feeling better is important, but it does not always mean the brain and body are ready for an immediate stop.
Monitoring usually involves regular review rather than just writing a prescription once.
Doctors may check side effects, mood, sleep, craving, other medications, and whether the dose is still appropriate. For some treatments, they may also monitor liver function, breathing risk, or signs of diversion and misuse.
Depending on the drug, monitoring can include:
supervised dosing
prescription checks
blood pressure or pulse checks
urine or breath testing
follow-up appointments to adjust the dose
The goal is to keep the treatment effective while reducing medical risk.
