What Does Cocaine Do to Your Heart? The Cardiovascular Risks Explained

Cocaine can cause serious and potentially even life-threatening risks to your heart. But these risks don’t only apply to people who have been using cocaine for years, because a single use can be enough to cause a medical emergency. Because those affected are typically young and appear well, they often do not recognise what is happening when their heart begins to react. Anyone who is using cocaine needs to understand what it does to the heart immediately, what changes with repeated use, and why mixing cocaine and alcohol is more dangerous than either substance on its own.

What happens to your heart when you take cocaine

Cocaine is a powerful stimulant, and within minutes of use, it causes a sharp rise in heart rate and blood pressure. It also causes a surge of adrenaline and the reuptake of neurotransmitters like noradrenaline, leaving your body saturated with adrenergic stimulation (the process that triggers your “fight or flight” response). This all sounds complex, but it basically means your nervous system is on overdrive, and your heart is suddenly working much harder.

At the same time, however, cocaine can also cause the coronary arteries to constrict. These are the vessels that supply blood and oxygen to the heart muscle itself. Research has shown that within fifteen minutes of even a low dose of intranasal cocaine, coronary vasoconstriction occurs in both healthy arteries and those already narrowed by disease.

This puts you in real danger because the heart is demanding more oxygen, but the arteries carrying that oxygen are narrowing. The result is the heart working against a worsening supply, under increasing load, and with less room for error.

Cocaine also increases platelet aggregability, which means the tendency of blood cells to clump together and form clots. This matters because it raises the risk of a clot forming inside the coronary artery itself, when the artery is already constricted and struggling to deliver enough blood.

All three of these things can happen at once, and any one of them on its own can cause a cocaine-related myocardial infarction (a heart attack that happens after cocaine use). However, together, the risk multiplies unpredictably. This is why cocaine can cause major cardiac events in people with entirely clean coronary arteries whose only risk factor is that they are taking cocaine.

The risk to young people

Cocaine can and does cause heart attacks in people who are young and otherwise healthy, and the numbers are not small.

A 2001 study published in Circulation found that approximately one in four nonfatal heart attacks among adults aged 18 to 45 was attributable to frequent cocaine use. A later study published in the Journal of the American College of Cardiology in 2018 analysed 2,097 patients who had suffered a heart attack at age 50 or younger, and cocaine use was identified in 4.7% of them.

Those patients were younger, had fewer risk factors like diabetes and high cholesterol, but had nearly double the risk of dying from cardiovascular causes over the following eleven years compared to non-cocaine users. A young person with no family history of heart disease, no hypertension, no diabetes, and no other conventional risk factors is not protected.

What changes with long-term cocaine use

The immediate effects of cocaine are where the acute danger comes from, but repeated use creates structural changes to your heart that are still there long after the cocaine has cleared your system.

Long-term cocaine use is associated with cardiomyopathy, a disease of the heart muscle that causes it to work less efficiently, increasing the risk of heart failure. 

It is also associated with accelerated coronary artery disease, where the arteries narrow progressively with continued use, and with left ventricular hypertrophy, an abnormal thickening of the heart’s main pumping chamber. These changes raise the underlying risk of a heart attack even when you haven’t been using cocaine for a period of time. 

Persistent hypertension is another consequence, as repeatedly elevated blood pressure leads to cumulative damage throughout your cardiovascular system. This can include damage to the arterial walls themselves, which increases the chances of heart attacks. 

Long-term users are also at increased risk of arrhythmias, meaning abnormal heart rhythms. Cocaine disrupts the electrical conduction system of the heart by interfering with sodium and potassium ion channels. This can produce an irregular heartbeat during use, but the risks of this may not disappear for a few hours after the cocaine clears your body.

Aortic dissection

One of the less-discussed but particularly serious cocaine-related cardiovascular events is aortic dissection. This is a tear in the wall of the aorta, which is the main artery carrying blood from the heart to the rest of the body.

What happens is that the sudden increase in blood pressure from cocaine creates stress at a section of the aorta that can’t flex to absorb the extra pressure. This section is called the ligamentum arteriosum, and it is where tears often occur in cocaine users.

Aortic dissection is the reason for fewer than 1% of cocaine-related cardiovascular cases, but it is disproportionately found in younger cocaine users and carries a high mortality risk.

The increased risk of using cocaine and alcohol together

A large proportion of cocaine users also drink alcohol, but when both substances are in your body together, your liver produces a third compound called cocaethylene. This metabolite does not form when either substance is used alone and is unique to the combination.

Cocaethylene is more cardiotoxic than cocaine on its own and remains in the body longer. A 2024 systematic review in the Journal of Clinical Medicine found that the presence of cocaethylene was associated with an 18 to 25-fold increase in the risk of sudden death compared to cocaine use without alcohol. It has also been linked to injury to the heart muscle (known scientifically as myocardial injury) and cardiac arrest through its effects on the heart’s ion channels.

Estimates suggest that around 74% of people who use cocaine also use alcohol simultaneously. Many people who drink while using cocaine are unaware that doing so is not simply adding one risk to another. It is producing a distinct, more dangerous compound.

Recognising the warning signs

The symptoms of cocaine-related cardiac events are not always obvious or dramatic. Chest pain, breathlessness, palpitations, and an irregular heartbeat are all warning signs that require immediate medical attention in anyone who has recently used cocaine. Symptoms can appear rapidly after use or be delayed by several hours.

Young, healthy-looking patients can be difficult to diagnose correctly because both the individual and the medical staff may not recognise what is happening. Studies have found that cocaine-related myocardial infarction is frequently underreported because cocaine’s intended effects mean many people just think that is why their heart is acting unusually, particularly when a cardiac event is smaller.

But anyone presenting with chest pain after cocaine use should seek medical attention immediately. Treatment decisions for cocaine-related chest pain are different from standard cardiac protocols, and withholding the information about drug abuse can result in the wrong treatment being given.

Getting support

The cardiovascular risks of cocaine are not an argument for using the drug carefully or in smaller amounts. There is no dose at which the processes described above are fully absent. If cocaine use has become a regular part of your life and you are finding it difficult to stop, it may be a sign of cocaine dependency.

Recovery Lighthouse offers confidential assessment and treatment for cocaine addiction, which has saved many people’s lives. If you have experienced heart issues because of cocaine or you’re just worried about how much you’re using, please reach out today to discuss your situation.