Cocaine Side Effects: Short-Term and Long-Term Risks

Cocaine can cause cardiovascular, neurologic and psychiatric side effects even after a single episode of use. Common acute effects include anxiety, restlessness, loss of appetite, insomnia, sweating, dilated pupils and increased heart rate and blood pressure. Serious complications include arrhythmia, heart attack, stroke, seizure, hyperthermia, psychosis and sudden death.

Long-term or repeated cocaine use can affect the heart, brain, nose and airways, sleep, nutrition, mood and cognitive functioning. Risks also change with the form of cocaine, pattern of use and whether alcohol, fentanyl or other substances are involved.

A person should not assume that cocaine is safe because they are young, physically fit or have used it before without a medical emergency. Cocaine-related cardiovascular events can occur unpredictably.

Cocaine Side Effects at a Glance

Short-Term Cocaine Side Effects

Short-term effects can include:

• Increased alertness
• Restlessness
• Anxiety
• Irritability
• Reduced appetite
• Insomnia
• Rapid heart rate
• Elevated blood pressure
• Sweating
• Dilated pupils
• Tremor
• Headache
• Nausea

These effects reflect stimulation of both the brain and sympathetic nervous system.

Cocaine and the Heart

Cocaine can make the heart work harder while constricting blood vessels. It can also alter electrical conduction and promote conditions that favor thrombosis.

Possible cardiovascular complications include:

• Chest pain
• Tachycardia
• Severe hypertension
• Abnormal heart rhythms
• Myocardial infarction
• Cardiomyopathy
• Aortic injury
• Sudden cardiac arrest

Can Cocaine Cause a Heart Attack in a Young Person?

Yes. Cocaine-related myocardial infarction is not limited to older adults with known coronary artery disease. The combination of increased cardiac demand, vasoconstriction and electrical instability can create a dangerous event in otherwise young people.

Any chest pain after cocaine exposure deserves medical assessment.

Cocaine and Blood Pressure

Cocaine can sharply increase blood pressure. Severe hypertension can place additional stress on the heart and blood vessels and contribute to stroke or vascular injury.

A person with hypertension or cardiovascular disease may have greater risk, but serious effects can also occur without a known diagnosis.

Cocaine and Stroke

Both ischemic and hemorrhagic stroke have been associated with cocaine use. Mechanisms include vasoconstriction, severe blood-pressure changes, vascular injury and effects on clotting.

Sudden neurologic symptoms require emergency care even when the person believes the cocaine effects are wearing off.

Cocaine and Seizures

Cocaine can lower the seizure threshold and produce seizures during acute toxicity. Seizure is not a routine side effect that should be watched at home.

A seizure after cocaine exposure requires emergency evaluation.

Cocaine and Body Temperature

Stimulants can impair the body’s ability to regulate temperature. Cocaine may increase heat production through agitation and increased muscle activity while also affecting heat dissipation.

Hyperthermia can become life-threatening and can contribute to muscle breakdown, kidney injury, clotting abnormalities and organ failure.

Cocaine and Anxiety

Anxiety is common, particularly as exposure increases or the expected euphoria begins to fade. Some people experience panic attacks, a sense of impending doom or extreme hypervigilance.

Using additional substances to calm the anxiety can create new risks, especially when alcohol, benzodiazepines or opioids are added.

Cocaine and Paranoia

Paranoia can develop during intoxication, repeated binge use or severe sleep deprivation. The person may misinterpret ordinary events as threatening or become intensely suspicious of others.

Paranoia can increase the risk of unsafe behavior, conflict and delayed medical care.

Cocaine Psychosis

Cocaine-induced psychosis can include hallucinations, delusions, severe paranoia and disorganized behavior. Symptoms may resolve after the stimulant clears and sleep returns, but they can also persist into early abstinence.

Persistent psychosis needs medical and psychiatric evaluation because an independent psychiatric disorder, another substance or a medical problem may be involved.

Cocaine and Sleep

Cocaine can delay sleep and produce long periods of wakefulness. Repeated use during a binge can cause severe sleep deprivation, which further worsens anxiety, irritability, judgment and psychosis risk.

The crash can then produce prolonged sleep or an unstable pattern of excessive sleeping mixed with insomnia.

Cocaine and Appetite

Cocaine commonly suppresses appetite. Repeated binge use can therefore lead to poor nutrition, dehydration and weight loss.

When use stops, appetite often rebounds during withdrawal.

Long-Term Cocaine Side Effects

Long-term problems can include:

• Cocaine use disorder
• Persistent cardiovascular disease
• Reduced exercise tolerance
• Mood problems
• Anxiety
• Sleep disturbance
• Cognitive problems
• Weight loss or poor nutrition
• Repeated nose or airway injury depending on route
• Greater sensitivity to paranoia and other negative stimulant effects

Cocaine and the Nose

Chronic exposure through the nasal cavity can injure blood vessels and tissue. DEA notes that chronic intranasal cocaine use can erode the upper nasal cavity.

Persistent nosebleeds, severe pain, discharge, loss of smell or structural changes need medical evaluation.

Cocaine and the Lungs

Inhaled cocaine can injure the respiratory system. People may develop cough, chest pain, shortness of breath or inflammatory lung complications.

Breathing symptoms should not automatically be assumed to be anxiety, particularly when chest pain, fever, low oxygen or coughing blood is present.

Cocaine and the Brain

Repeated stimulant exposure can affect attention, memory, decision-making and impulse control. These cognitive changes can interfere with treatment because the person may struggle to plan, remember instructions or evaluate consequences.

SAMHSA recommends treatment approaches that account for cognitive impairment rather than assuming poor concentration means a lack of motivation.

Tolerance and Sensitization

A person can become tolerant to some desired cocaine effects while becoming more sensitive to adverse effects such as anxiety, paranoia or cardiovascular stress.

This creates a dangerous pattern in which someone uses more cocaine trying to recreate earlier euphoria while negative effects become increasingly prominent.

Cocaine and Alcohol Side Effects

Alcohol and cocaine can form cocaethylene, an active metabolite associated with additional cardiovascular risk. The combination can also impair judgment and encourage heavier use of both substances.

See Cocaine and Alcohol.

Cocaine and Fentanyl Side Effects

Fentanyl exposure can add a completely different toxicity pattern: slowed or stopped breathing, severe sedation and inability to wake. A person exposed to both cocaine and fentanyl can show mixed stimulant and opioid signs.

See Cocaine and Fentanyl.

Cocaine Side Effects vs. Withdrawal

Anxiety, irritability and mood changes can occur during both intoxication and withdrawal. The pattern after stopping tends to shift toward fatigue, depressed mood, increased appetite, sleep disturbance and craving.

See Cocaine Withdrawal for the timeline.

Cocaine Side Effects Can Change Across a Binge

The same person can experience different effects over the course of a binge. Early exposure may feel energizing or euphoric, while later exposure produces more anxiety, irritability, repetitive behavior or paranoia.

SAMHSA describes this as tolerance developing to some positive effects while negative effects can become more prominent. The shift can encourage more cocaine use even as the medical margin becomes less safe.

Cocaine and Repeated Chest Pain

Repeated episodes of chest pain should not be normalized simply because prior emergency testing was reassuring. Each exposure creates a new period of cardiovascular stress.

People with ongoing cocaine use may also develop longer-term cardiac changes that make future events more likely.

Cocaine and Sexual Health

Cocaine can initially increase confidence, energy or sexual drive in some people, but repeated use can impair judgment and increase high-risk behavior. Long-term stimulant use can also interfere with sexual function and relationships.

Sexual-health screening, HIV and hepatitis testing, and safer-sex counseling may be relevant parts of treatment depending on the person’s exposure history.

Cocaine Side Effects During Pregnancy

Cocaine use during pregnancy can create serious maternal and fetal risks through vasoconstriction, hypertension and placental effects. Pregnancy also changes the threshold for medical evaluation after stimulant exposure.

A pregnant person using cocaine should receive obstetric and substance-use assessment rather than waiting for withdrawal or a medical crisis.

When Is a Cocaine Side Effect an Emergency?

Seek emergency care for:

• Chest pain
• Seizure
• Stroke symptoms
• Collapse
• Severe headache with neurologic symptoms
• Dangerous overheating
• Severe agitation or psychosis
• Suicidal thoughts
• Abnormal breathing
• Inability to wake

If opioid contamination is possible and breathing is slow or the person cannot be awakened, give naloxone if available.

Cocaine Side Effects by Body System

Cocaine affects several organ systems at the same time. Thinking about effects by body system helps explain why a single exposure can produce symptoms that seem unrelated.

Cocaine and Abdominal Emergencies

Cocaine constricts blood vessels throughout the body, not only in the heart. Severe abdominal pain after cocaine exposure can signal reduced blood flow to the gastrointestinal tract or another acute medical problem.

Persistent or severe abdominal pain, vomiting blood, bloody stool, fainting or signs of shock require urgent evaluation. They should not be attributed automatically to anxiety or an upset stomach.

Cocaine and Kidney or Muscle Injury

Severe agitation, seizures and hyperthermia can contribute to muscle breakdown. The products of muscle injury can then place substantial stress on the kidneys.

Dark urine, severe muscle pain, weakness, overheating or reduced urine output after intense stimulant toxicity require medical evaluation. These complications can occur as part of a broader multiorgan emergency.

Why Cocaine Side Effects Can Become More Negative Over Time

Repeated cocaine use does not guarantee that the experience becomes easier to tolerate. Some people become less responsive to the desired euphoric effects while anxiety, suspiciousness, agitation or repetitive behavior becomes more prominent.

This can create a dangerous escalation pattern: the person uses more cocaine trying to recreate an earlier effect while cardiovascular and psychiatric consequences become increasingly severe.

Side Effects After Cocaine Has Worn Off

The end of the noticeable high does not end every risk. Chest pain, headache, mood changes, exhaustion, paranoia and sleep disruption can continue. Some cardiovascular and neurologic complications also develop during a period when the person no longer feels intensely stimulated.

Medical decisions should therefore be based on symptoms rather than on whether the person believes the cocaine is “out of their system.”

Frequently Asked Questions About Cocaine Side Effects

What are common cocaine side effects?

Anxiety, restlessness, insomnia, appetite suppression, sweating, dilated pupils, rapid heart rate and elevated blood pressure are common.

Can cocaine cause a heart attack?

Yes. Cocaine can cause myocardial infarction and dangerous arrhythmias even in people without known heart disease.

Can cocaine cause paranoia?

Yes. Paranoia and stimulant-induced psychosis can occur, especially with repeated use and severe sleep deprivation.

Can cocaine cause a stroke?

Yes. Cocaine is associated with both ischemic and hemorrhagic stroke.

Can cocaine cause long-term brain changes?

Repeated stimulant use can affect reward processing, attention, memory and executive function.

Can cocaine side effects continue after the high ends?

Yes. Cardiovascular, psychiatric and withdrawal effects can continue after the subjective high has faded.

Sources

• U.S. Drug Enforcement Administration: Cocaine Drug Fact Sheet: current federal drug description, forms, adverse effects and controlled-substance information.
• SAMHSA TIP 33: Treatment for Stimulant Use Disorders, Updated 2021: cocaine effects, withdrawal, medical complications and evidence-based treatment.
• CDC: Stimulants and Overdose Prevention: current stimulant-overdose risks and U.S. cocaine-overdose context.
• CDC/NCHS: Drug Overdose Deaths in the United States, 2023-2024: final 2024 national cocaine-involved overdose mortality data.
• SAMHSA: Treatment of Stimulant Use Disorders: evidence-based treatment guidance for cocaine and other stimulant use disorders.