Mixing meth and alcohol can increase the risks of side effects, addiction and overdose. This is because of the way that the two substances interact with each other. This page looks at how alcohol and meth interact, the health risks of mixing both, and what help is available.
If you or someone you know is living with an addiction to alcohol and meth, remember that recovery is possible with the right support.
Questions about mixing meth & alcohol?
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Understanding addiction to alcohol and meth
Mixing meth and alcohol is a pattern that tends to develop gradually, because each substance appears to offset the effects of the other. This can make it harder to spot the signs that a substance use disorder is developing.
Heavy drinkers are also more likely to use methamphetamine, putting them at increased risk of developing an addiction to meth and alcohol. Research published in the American journal Drug and Alcohol Dependence found that people who reported frequent alcohol intoxication were five times more likely to also report using methamphetamine, compared to non-drinkers. This study drew on American data from 1999, but the broader pattern holds closer to home. According to the European Union Drugs Agency (EUDA), polydrug use (also called cross addiction) – using more than one substance regularly – is common across Europe among people who seek treatment for drug-related challenges.
Mixing alcohol and meth can also make it harder to quit. When two substances are used together regularly, the body can begin adapting to both. Over time, stopping either one becomes more difficult, and the health effects of both become harder to separate. Alcohol addiction and meth addiction often develop alongside each other, and addressing both addictions together is important for lasting recovery.
What are the risks of mixing meth and alcohol?
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Is it safe to drink alcohol after using methamphetamine?
No, it’s not safe to drink alcohol if you’ve recently used methamphetamine. The two substances interact in ways that are difficult to predict. The masking effects mean you might not experience the usual warning signs of intoxication or overdose.
Methamphetamine is a stimulant. It speeds up the central nervous system, increases alertness, and suppresses appetite. Alcohol works in the opposite way. It is a depressant that slows brain activity and reduces the ability to make clear judgements.
When you mix meth and alcohol, these effects don’t simply balance each other out. According to a 2023 study published in the Journal of Psychopharmacology, the stimulant effects of methamphetamine appear to mask the sedative effects of alcohol, even at low doses. This means that the signals your body normally uses to gauge intoxication can become unreliable.
When you feel less drunk than you actually are, you are more likely to drink more. It can work the other way around too. The stimulating effects of methamphetamine can appear reduced when alcohol is present, so you may also use more methamphetamine. The same study found that heart rate was significantly elevated when both substances were taken together, compared to either substance alone.
A 2019 paper published in Biomedicines noted that mixing meth and alcohol can sometimes amplify the harmful properties of both. Combined use can produce additive or synergistic toxic effects that go beyond what either substance causes alone, placing serious strain on the cardiovascular system and brain.
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Impacts of meth and alcohol on the brain and body
Neuroscience & Biobehavioral Reviews published a detailed review in 2021 examining the consequences of combined alcohol and methamphetamine use. Their findings outlined that brain development, cognition, motor function and physical health are all adversely affected. It notes that the toxic effects of methamphetamine on the brain are augmented by alcohol use, to the point of causing cellular damage. This means that alcohol can make the damage caused by methamphetamines worse.
The most immediate cardiovascular risk is increased heart rate and blood pressure. Cognitive effects follow: verbal learning and coordination are both impaired, and the tendency to make risky decisions increases. This includes decisions about driving or sexual behaviour that people would not ordinarily take.
Alongside the physical effects, the 2021 Stafford et al. review noted that using two or more substances together can intensify drug-related mental health consequences and reduce the effectiveness of standard treatment approaches
Long-term cognitive effects are also well-documented. Problems with attention, verbal learning and executive function – the brain’s ability to plan, make decisions and regulate behaviour – are associated with sustained use of both substances.
Research published in Behavioural Brain Research found that prior alcohol use can change how the brain responds to cues associated with methamphetamine – even after a long period of abstinence. It found that the two substances can alter each other’s hold on the brain in ways that persist well into recovery. So, treatment needs to address both dependencies together.
Short-term risks of using meth and alcohol together
- Suppressed appetite
- Reduce ability to make clear judgements
- Increased heart rate and blood pressure
- Increased risk of overdose
- Increased likelihood of making risky decisions
Long-term risks of mixing alcohol and meth
- Increased risk of heart failure or stroke
- Damage to liver and kidney function – places stress on the body’s major organs
- Reduced effectiveness of treatment approaches
- Reduced attention, ability to verbally learn, and executive function
Risk of overdose and death when mixing alcohol and methamphetamine
Overdose is a serious risk of mixing alcohol and crystal meth. Each substance can mask the warning signs of overdose associated with the other. This means you might not spot the usuals signs that you have taken too much until you’ve reached a dangerous level of intoxication.
If you are concerned that someone may be experiencing an ove
An overdose is a life-threatening emergency. Call 999 immediately if you think someone has overdosed.
Signs of overdose include:
- Irregular or very slow breathing
- Seizures
- Vomiting
- Loss of consciousness
- Pale or blue-tinged skin
Risks of withdrawal from alcohol and meth
Alcohol withdrawal can itself be dangerous without medical support. It can cause seizures and, in serious cases, a condition called delirium tremens, which requires urgent medical attention.
Stopping methamphetamine after regular use can also be difficult. Physical withdrawal symptoms are generally less significant, but psychological effects can be severe. These may include intense low mood, exhaustion, and in some cases thoughts of suicidality or self-harm. Medical support during this period is strongly recommended
For people who have been using both substances together, the withdrawal process requires careful clinical assessment. Attempting to stop either substance without medical guidance is not recommended.
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Rehab treatment for alcohol and methamphetamine
Recovery from alcohol and methamphetamine addiction is possible with the right support. It’s important that treatment addresses both dependencies together, alongside any mental health conditions that may have developed alongside them.
At Castle Craig, we offer inpatient treatment for people managing alcohol and drug rehabilitation in Scotland. Our treatment includes:
- Medically supervised detox so that withdrawal from both substances is managed carefully and safely
- Individual and group therapy with trauma-focused approaches
- Therapeutic approaches including Cognitive Behavioural Therapy (CBT), Dialectical Behaviour Therapy (DBT), and Eye Movement Desensitisation and Reprocessing (EMDR)
- 12 Step facilitation
- Complementary therapies including mindfulness meditation, acupuncture, animal-assisted therapy and drumming therapy
- Rehab aftercare programme that recognises that support needs to continue beyond discharge through structured aftercare and alumni networks
If you would like to talk about immediate rehab admissions or find out whether treatment at Castle Craig is right for you, our team is available to answer your questions without pressure.
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