Why is mixing cocaine and alcohol so dangerous?

In short

• Cocaine and alcohol together make a third drug in your liver, cocaethylene. It lasts longer in the blood than cocaine and, according to a 2022 review in Cureus, is considered more toxic to the heart and liver.
• The risk is to the heart. A 2024 systematic review by van Amsterdam, Gresnigt and van den Brink concluded that using both clearly leads to higher mortality, and that the presence of cocaethylene carries an 18- to 25-fold increase in the risk of sudden death compared with cocaine alone.
• Chest pain after a night on both is an emergency. Call 10177 or 112 from a mobile. When the pair has become a habit, Renewed Life Center in Lakeside, Cape Town, treats the drinking and the cocaine in one plan, with detox on site under 24-hour nursing supervision.

Can’t have one without the other any more? Book a free, confidential call. Twenty to forty minutes about the cocaine and the drinking, and a husband, wife or parent can ring in your place.

A few drinks after work, and then someone has a bag. One line and you feel sober again, sharp and funny and ready for the next round. By two in the morning you have drunk twice what you would on a normal night and still feel fine. The next day your heart is racing and the dread is worse than any hangover you remember. This page is for anyone who knows that pattern, and for the partner, parent or friend who keeps watching it happen. Family and friends can make the first call about the cocaine and the drinking too.

What happens in your body when you mix cocaine and alcohol?

When cocaine and alcohol are in your body together, the liver combines them into a new substance called cocaethylene. It acts like cocaine, gives a similar high and lasts longer. The Cureus review gives its elimination half-life as about two hours, against about one hour for cocaine, and describes it as more toxic to the heart and liver.

Cocaethylene is generated only through the interaction between alcohol and cocaine. A 2022 review of cocaine’s chemistry and toxicology in Toxins describes it as a biomarker for co-consumption of cocaine with alcohol, which is how laboratories can tell that someone took both.

The US National Institute on Drug Abuse puts it in two sentences: “Many people who use cocaine also use alcohol, and this combination can be particularly dangerous. The two substances react to produce cocaethylene, which may increase the toxic effects of cocaine and alcohol on the heart.” That is from NIDA’s cocaine page.

Most people who use cocaine drink while they use. A 2018 meta-analysis by Liu and colleagues in Drug and Alcohol Dependence put the figure at 74%.

So a night on both means three substances rather than two: the cocaine, the alcohol, and a longer-lasting stimulant your body made from them, all working on the heart at once.

Why do people drink more on cocaine?

Cocaine can make you feel less drunk than you are. The stimulant keeps you alert while the alcohol keeps rising, so you can drink past the point where you would normally slow down or go home. The Cureus review also notes that people use alcohol to enhance or prolong the cocaine high and to soften the abrupt comedown.

In a 1993 controlled trial by Farré and colleagues, volunteers given cocaine with alcohol had stronger euphoria and scored better on the reaction tests that alcohol normally spoils, while their heart rate rose sharply. Cocaine blood levels were also higher when alcohol was on board. They felt sharper while their hearts worked harder.

Each drug covers for the other. Cocaine takes away the sleepiness and clumsiness of drinking, while alcohol takes the edge off the jittery, anxious end of a line. Together they let you keep going for hours, and that is a big part of why the combination is so easy to repeat.

Half-life and heart findings in the table come from the Cureus review and the 2024 systematic review. The rest is the ordinary pattern people describe the morning after.

How does mixing cocaine and alcohol affect your heart?

It puts more strain on the heart than cocaine alone and raises the risk of dying. The 2024 systematic review in the Journal of Clinical Medicine found a higher myocardial workload when the two are combined and concluded that co-use poses an additional risk of cardiovascular deaths compared with cocaine alone.

Its sharpest finding concerns cocaethylene. The authors report that its presence carries an 18- to 25-fold increase in the risk of sudden death over cocaine-alone use, and that it is associated with heart muscle injury and cardiac arrest. They note that some results on symptoms are inconsistent, while the conclusion on deaths holds.

Cocaine is already hard on the heart. In a study of 3,946 heart attack patients, the risk of a heart attack was 23.7 times higher than baseline in the hour after cocaine use. Those who had used cocaine were on average 44 years old, against 61 for the others. Adding alcohol on top raises that risk further.

The danger on a night out goes beyond the heart. Among trauma patients, the same Cureus review reports that the presence of cocaethylene significantly increased the odds of intensive care admission (odds ratio 5.9).

What should you do if someone becomes unwell after cocaine and alcohol?

Call an ambulance straight away if someone has chest pain, trouble breathing, a seizure, severe agitation, confusion or a very high temperature, or cannot be woken. In South Africa that is 10177 for an ambulance, or 112 from any mobile. Tell the paramedics exactly what was taken.

If there is chest pain, call rather than waiting to see if it passes, and do not give them any medicine yourself. Hospitals treat cocaine chest pain differently from an ordinary heart attack, avoiding some common heart medicines, so the paramedics need to know about the cocaine.

After a scare like this, many people promise themselves it was the last time. The promise often breaks, because the combination was doing something for them that a promise cannot replace. At Renewed Life Center, every client is examined by our resident GP, Dr John Wulz, whose background is in mental health and emergency medicine. Where heavy drinking means withdrawal needs watching, detox runs under 24-hour nursing supervision, with medication only when clinically indicated and prescribed.

Had a scare and don’t want another? Talk to us for free today. Nurses watch the detox 24 hours a day, and the therapists work in the same house.

Is it one habit or two addictions?

Usually it has become two addictions that feed each other. You drink, and the drinking brings the craving for a line; you use, and the line needs a drink to take the edge off. Because each one cues the other, stopping one while keeping the other rarely lasts, so treatment has to cover both.

Look at what the combination does for you. For many people it is confidence, energy, the feeling of being good company after a week of feeling flat. For others it is numbness, a way to get out of their own head for a night. The substances are how you get there, but the need underneath is what brings the weekend back round.

It is common to think the problem is only the cocaine, and that a few drinks are fine. If your drinking reliably ends in a call to a dealer, the first drink is where the cocaine night starts, and treating one without the other leaves the loop in place.

A 1999 aftercare study by McKay and colleagues found that people who relapsed to cocaine were far more likely to have been drinking first. At six months, 62% of relapses followed drinking that same day, against none of the near misses, when people came close to using and did not.

Here it helps to have people on the team who have lived it. John Roberts, our Senior Recovery Specialist and Operations Manager, has 39 years of personal recovery. In the programme, evenings have their own structure, with 12-step meetings and recovery walks, so the hours that used to end in a bar or a bathroom stall are filled with something else.

Drinking leads to using, every time? Book a free call. We treat both in one plan, and admission can be immediate, typically within three days of first contact.

Is cocaine use rising in South Africa?

Yes, in line with a global rise. The UNODC World Drug Report 2025 estimates that 25 million people used cocaine in 2023, up from 17 million in 2013. Illegal production reached a record of more than 3,708 tons in 2023, a third more than the year before.

South Africa is part of the same trend. Five national household surveys show that recent cocaine use among people aged 15 and over rose from 0.02% in 2002 to 1.8% in 2017. In early 2025, crack or cocaine was the main drug in 3% of treatment admissions nationally, ranging from 1% in Gauteng to 11% in KwaZulu-Natal.

The same SACENDU research brief puts the average age of people in treatment for cocaine at 33 years. That fits the pattern of a working adult with a social life, where cocaine often arrives at the same table as the drinks.

The Western Cape stands out for mixing. In the first half of 2025, 60% of people entering treatment in the province named more than one substance, the highest rate of any region against 48% nationally, per the same brief.

How is cocaine and alcohol use treated?

It is treated as one problem with one plan: a medical assessment, a safe detox from alcohol where it is needed, then therapy for the reasons behind both, practical skills for the nights that used to end in using, and a written plan for going home. Treating the pair together keeps one drug from quietly taking the other’s place.

The NHS takes the same line. Its guidance on getting help for cocaine says that people who are also addicted to alcohol or other substances “should be offered specialised help with this too”.

Alcohol is the part that can be medically risky to stop. The MSD Manual notes that severe alcohol withdrawal, delirium tremens, may be fatal, which is why heavy daily drinkers should not stop alone. Coming off cocaine brings a different risk: the days after can bring deep low mood. If that turns into thoughts of ending your life, the Suicide Crisis Helpline is 0800 567 567, day or night.

At Renewed Life Center, detox and therapy happen in one house. Individual psychotherapy runs typically three times a week in the first phase, with group therapy five or more times a week. The group programme, Monday to Friday, 09:00 to 16:00, includes relapse prevention, DBT skills, schema therapy and psychoeducation. Depression and anxiety are treated in the same plan through our dual diagnosis work, led on the psychological side by Dr Ruby Weber. More on drug addiction treatment and alcohol addiction treatment in Cape Town.

Why do people choose Renewed Life Center for cocaine and alcohol?

Because both substances, and what sits under them, are treated together by one team in one house. You are not detoxed from alcohol in one place and then sent somewhere else to start on the cocaine.

A doctor with emergency experience examines you on arrival. Dr John Wulz, our resident GP, has a background in emergency medicine. Medical detox runs where clinically indicated, with 24-hour nursing supervision, and therapy starts in the same house as soon as you are well enough.

Residential care, sober living and aftercare stay with the same team, so the Friday-night plan you go home with is written by people who already know you.

Far from the usual bar and the usual dealer. The house is in Lakeside, with the mountain ridge directly behind it, about two kilometres from Muizenberg beach. You pay us directly, so the clinical picture sets the length of stay, and airport transfers at Cape Town International are included both ways.

How do you start?

Start with a free, confidential conversation of twenty to forty minutes by WhatsApp, video or phone, including the morning after a bad night. Within three days a clinical assessment of 45 to 90 minutes maps out the cocaine and the drinking and what sits under it. From there, admission can be immediate, and in the typical case it is within three days of first contact.

Arrange the free call, or start with a few lines through our contact page. We reply the same day.

Questions people ask

This article is general information, not medical advice.

Sources

1. van Amsterdam, Gresnigt and van den Brink, Cardiovascular risks of simultaneous use of alcohol and cocaine: a systematic review, Journal of Clinical Medicine, 2024, PMID 38592322
2. Pergolizzi et al., Cocaethylene: when cocaine and alcohol are taken together, Cureus, 2022, PMC8956485
3. Roque Bravo et al., Cocaine: an updated overview on chemistry, detection, biokinetics, and pharmacotoxicological aspects, Toxins, 2022, PMID 35448887
4. Mittleman et al., Triggering of myocardial infarction by cocaine, Circulation, 1999, PMID 10351966
5. National household surveys on drug use in South Africa, 2002-2017, PMID 38367327
6. SAMRC, SACENDU Research Brief, Vol 29 (1), 2026
7. StatPearls, Cocaine toxicity
8. MSD Manual Professional Version, Alcohol toxicity and withdrawal
9. British Red Cross, unresponsive and breathing
10. City of Cape Town, emergency contact numbers
11. Western Cape Government, Know who you can call in an emergency
12. South African Depression and Anxiety Group, helplines
13. National Institute on Drug Abuse, Cocaine
14. Liu et al., The importance of considering polysubstance use: lessons from cocaine research, Drug and Alcohol Dependence, 2018
15. Farré et al., Alcohol and cocaine interactions in humans, Journal of Pharmacology and Experimental Therapeutics, 1993
16. McKay et al., The relationship of alcohol use to cocaine relapse in cocaine dependent patients in an aftercare study, Journal of Studies on Alcohol, 1999
17. UNODC, World Drug Report 2025, Key findings
18. NHS, Cocaine: get help