Why is mixing cocaine and alcohol so dangerous?

The liver makes it whenever both are in your body, so the risk is there whether you use once a year or every weekend.

What are the short-term risks of mixing cocaine and alcohol?

On the night itself, the risks are a racing heart, higher blood pressure and body temperature, far more drink than you realise, and a temper that turns faster. A 2024 systematic review¹ linked using the two together to an 18- to 25-fold higher risk of sudden death than cocaine alone.

Alcohol brings blackouts, vomiting and, on a heavy night, alcohol poisoning, along with the lowered guard in which a first line seems like a good idea. Cocaine adds anxiety, paranoia and, at higher doses, aggression. The pairing is common: a 2018 meta-analysis by Liu and colleagues estimated that 74% of people who use cocaine drink at the same time.

Why do people drink more on cocaine?

Cocaine can make you seem and feel less drunk than you are, so you drink past the point where you would normally go home. In a 1993 trial by Farré and colleagues, nine volunteers given both felt stronger euphoria than on cocaine alone, did better on reaction tests than on alcohol alone, and had a marked rise in heart rate.

What is a comedown from cocaine and alcohol?

A comedown is the crash as your body clears the drugs, usually the next day: flat mood, anxiety, broken sleep and a pull to use again. The drink adds hangxiety, the anxious morning after, and the loop closes: the Sunday dread gets treated with a drink, and the drink calls for a line. When the low keeps coming back between weekends, depression or anxiety often sits under the use.

How does mixing cocaine and alcohol affect your heart?

Mixing cocaine and alcohol puts more strain on the heart than cocaine alone. Heart rate climbs higher when the two are taken together, and cocaethylene adds a load of its own, so the heart works harder for longer than it would after a line on its own.

Cocaine is already hard on the heart. In a study of 3,946 heart attack patients published in Circulation, the risk of a heart attack was 23.7 times higher than baseline in the hour after cocaine use, and those who had used cocaine were on average 44 years old, against 61 for the others.

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

If someone has chest pain or tightness, trouble breathing, a seizure, severe agitation or paranoia, confusion or a very high temperature, or cannot be woken, call local emergency services immediately. Do not wait for a WhatsApp reply.

Tell the paramedics exactly what was taken and how much was drunk. If the person is unresponsive but breathing normally, put them on their side and stay with them; if breathing stops or comes in gasps, start CPR as the call-taker tells you.

What are the long-term risks of mixing cocaine and alcohol?

Over months and years the pair wears on the heart, the liver, the brain and your mood from two sides. Alcohol, according to the WHO, plays a causal role in more than 200 diseases, injuries and other health conditions, among them cancers, heart disease, depression and anxiety. Long-term cocaine use is linked to stroke, seizures and paranoia. Cocaethylene adds to the harm: it is considered more toxic to the heart and liver than cocaine.

Mood is the part that can turn dangerous. Comedowns stacked on hangovers, weekend after weekend, can deepen into depression, and thoughts of ending your life need a professional’s attention now rather than after the next weekend. If you might act on them or cannot keep yourself safe, get emergency help immediately rather than waiting for a reply from us; the SADAG Suicide Crisis Helpline⁷ is 0800 567 567. Once you are safe, you or someone close to you can talk to us about the cocaine, the drinking and how low the weeks in between have become. With us, the low after each weekend is treated in the same stay as the drinking and the cocaine, and Ruby Weber, the psychologist who heads psychology at the centre, leads the work on depression.

Cocaine and alcohol addiction: one habit or two?

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. Research with men in cocaine aftercare found that drinking was tied to cocaine relapse, particularly drinking on the day of the relapse. If your drinking reliably ends in a call to a dealer, the first drink is where the cocaine night starts. NIDA’s treatment principles say most people with severe addiction use more than one drug and need treatment for all of them.

How do you stop using cocaine and alcohol?

Tell someone you trust, stop both with help, and if you drink most days, do not stop suddenly on your own. Coming off cocaine is not usually medically dangerous the way alcohol withdrawal can be, but the crash is hard, and the MSD Manual notes that severe alcohol withdrawal, delirium tremens, may be fatal⁶. What that first week looks like is in the alcohol withdrawal timeline, and the options for cutting down or stopping are in our guide on how to stop drinking alcohol.

If it is you, the useful questions are the hard ones: whether you drink every day or most days, how often a night that started with drinks ends with a call to a dealer, and what happened the last time you tried to skip a weekend. Bring those answers to a first conversation with us, as they are. Help comes at different levels, from counselling while you live at home to a detox and a residential stay, and the clinical assessment looks at which one fits.

If you drink every day, talk to us before you stop. A doctor examines you after you arrive, and if your body needs a detox, our medical team runs it. If you have already stopped and withdrawal has started at home without a seizure, confusion or other emergency signs, see your own doctor or a clinic today for a medical assessment, and talk to us alongside that about a supervised detox. A WhatsApp reply from us is not medical care for withdrawal that is already under way.

Is it someone you love?

Families rarely see the cocaine first. They see the drinking change shape:

• He goes to the bathroom every half hour at a braai, and comes back talking fast.
• She drinks all evening and never seems drunk, then cannot sleep until four.
• Money goes out on a Friday and nobody can say where.

Several of these together, over weeks, are the usual pattern. You do not need proof to write to us, and a relative can talk to our team before the person has agreed to come. The page on how to talk to a loved one about rehab has the words for the conversation itself.

Worried about someone who mixes the two? Tell us what you have seen.Worried about someone who mixes the two? Call +27 79 880 0045, free and confidential.

How is cocaine and alcohol addiction treated?

You do not have to call yourself an alcoholic to come to us: if the drinking and the cocaine go together, we plan for both. Cocaine and alcohol addiction 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, and a written relapse-prevention plan built for your home. At Renewed Life Center, if you need a detox, our medical team runs it, and the work on the cocaine and the drinking continues with the same team.

For many people the need is older than the cocaine: feeling unsure around people, or a week of pressure that only a big Friday seemed to let out. CBT and DBT work on the moment a craving hits; schema therapy, EMDR and TRE on the older patterns and trauma. Depression and anxiety are worked on alongside them through our dual diagnosis work, and Dr John Wulz, our GP, who has a background in mental health and emergency medicine, reviews any medication you already take, such as antidepressants.

The people you will talk to have worked in this field for years, and several are in recovery themselves. Ruby Weber has worked with South African and international clients in addiction for more than 20 years. Nikki Edwards, who leads the programme as Programme Director and Clinical Manager, has also been in recovery for 11 years.

Most clients stay into a second month. In the first month you get safe and steady, and your own counsellor works with you one-to-one every week, alongside group work every weekday. The second month goes deeper into what the cocaine and the drinking were covering. After that, some people move to the Recovery Integration Programme, still living with us but going out on their own in the afternoons, or to sober living on the same property. Families join a group by video every week, and relatives can have sessions of their own.

Is cocaine use rising in South Africa?

Between 2002 and 2017 it did: across five national household surveys, cocaine use among South Africans aged 15 and over rose from 0.02% to 1.8%. In early 2025 crack or cocaine was the main drug in 3% of treatment admissions nationally, and in the Western Cape 60% of people entering treatment used more than one substance, against 48% nationally (SACENDU, 2026).

How do you start?

You can write the morning after a bad night; that is a common time to start.

The first conversation is usually with John Roberts, Senior Recovery Specialist and Operations Manager, who has 39 years of personal recovery. The fee depends on the programme and how long you stay; we give it on that first call and send it in writing the same day. Nobody arrives with the right words. “I think I have a problem with coke and drinking” is enough, and so is “I am writing about my husband”. Send that one line on WhatsApp, and we take it from there.

Questions people ask

Is it safer to have cocaine without drinking?

Somewhat. Cocaine on its own is still hard on the heart; drinking adds cocaethylene and more strain on top.

How long do cocaine and alcohol stay in your system?

Cocaine has a half-life of about one hour in the blood and cocaethylene about two hours, so the mix lingers longer than cocaine alone. Test windows are on the pages on how long drugs stay in your system and how long alcohol stays in your system.

Can you die from mixing cocaine and alcohol?

Yes. The 2024 systematic review linked combined use to an 18- to 25-fold higher risk of sudden death than cocaine alone. The signs that mean calling emergency services straight away are in the section on what to do if someone becomes unwell.

I only do it at weekends. Is that a problem?

The heart risk is there every time you combine them. If weekends are getting longer, more frequent or harder to skip, that is worth a free conversation with us before you decide anything.

What about my job?

A residential stay means living with us for a while, but you can keep working remotely during treatment; you agree with your counsellor how much work fits around the programme. On the first call we talk through what to tell your employer and when, in confidence. See will I lose my job if I go to rehab.