Stimulants
Cocaine
High cardiovascular risk, high addiction liability, and one of the most adulterated substances on the market. Cocaine is responsible for more emergency department visits than any illicit drug except opioids — and fentanyl contamination is making that worse every year.
The Basics
Short high, long consequences
Cocaine blocks the reuptake of dopamine, norepinephrine, and serotonin — with dopamine being the primary driver of its euphoric and addictive effects. Insufflated (snorted), the high lasts 15–30 minutes. Smoked (crack cocaine), it lasts 5–10 minutes. This extremely short duration is a core part of why cocaine is so compulsive — the reward loop fires fast and fades fast, driving redosing.
The experience: intense euphoria, confidence, energy, talkativeness, reduced appetite, and a feeling of invincibility that doesn't correspond to reality. Cardiovascular effects are significant even at recreational doses — cocaine is a potent vasoconstrictor that raises heart rate, blood pressure, and cardiac workload. Most cocaine-related deaths are cardiac events, not overdoses in the traditional sense.
⚠ Fentanyl contamination
Fentanyl is increasingly found in cocaine supply chains — whether through cross-contamination or intentional adulteration. This is not a theoretical risk. People are dying from cocaine they didn't know contained fentanyl. Fentanyl test strips detect fentanyl in your supply before you use it. They cost roughly $1 each. Naloxone (Narcan) should be accessible whenever stimulants are being used. You cannot tell by looking, tasting, or smelling whether cocaine contains fentanyl.
The Science
Dopamine reuptake — why it's so addictive
Dopamine reuptake inhibition
Cocaine blocks DAT (dopamine transporter), preventing dopamine from being cleared from synapses. This produces intense reward signaling. Unlike amphetamines, cocaine doesn't force release — it prevents cleanup. The distinction matters pharmacologically but not practically for addiction risk.
Cardiovascular toxicity
Cocaine is a sodium channel blocker (local anesthetic) and potent vasoconstrictor. It raises heart rate, blood pressure, and cardiac oxygen demand while reducing oxygen supply. This combination is why cocaine causes heart attacks in otherwise healthy people — including young people with no cardiac history.
Addiction neuroscience
Roughly 15–20% of people who use cocaine develop a substance use disorder. The short duration of action drives compulsive redosing. Chronic use downregulates dopamine receptors — producing anhedonia (inability to feel pleasure) that drives continued use.
Cocaethylene
Combining cocaine with alcohol produces cocaethylene in the liver — a compound with its own psychoactive and cardiotoxic properties. Cocaethylene has a longer half-life than cocaine and increases cardiac risk beyond either substance alone. This combination is extremely common and extremely dangerous.
Harm Reduction
If you're going to use it anyway
This section exists because people use cocaine regardless of what anyone tells them. Honest information reduces harm more than abstinence messaging that gets ignored.
Test for fentanyl. Every time. Every batch. Fentanyl test strips in a small amount of water + a tiny sample. Two minutes. This is the single most important harm reduction practice for cocaine right now.
Have naloxone (Narcan) accessible. If your cocaine contains fentanyl and you or someone overdoses, naloxone reverses opioid effects. It does nothing for cocaine — but it saves lives when the cocaine isn't just cocaine. Available without prescription in most states.
Cocaine + alcohol is significantly more dangerous than either alone. Cocaethylene formation multiplies cardiac risk. If you're combining them, you're taking a risk that most people underestimate dramatically.
Nasal damage from insufflation is cumulative. Saline rinses between sessions, avoiding sharing straws/tubes (hepatitis C transmission), using smooth surfaces (not rolled bills), and allowing recovery time between uses all reduce damage. The septum is not infinitely resilient.
The compulsive redosing pattern is the substance working as designed. If you plan to use, set an amount and commit to it before you start. Once you're high, your judgment about whether to do more is compromised by the drug itself. This is the mechanism, not a character flaw.
Cardiovascular warning signs: chest pain, left arm pain, irregular heartbeat, severe headache, shortness of breath. These are emergencies. Call 911. Good Samaritan laws in most states protect you from drug-related prosecution when calling for medical help.
Cardiovascular considerations. Cocaine's cardiovascular profile kills people who don't die from contamination. Acute vasoconstriction, severe blood pressure spikes, and heart attacks have occurred in otherwise healthy first-time users. Any cardiovascular condition — hypertension, arrhythmias, structural heart disease, family history of cardiac events under 50 — is a hard contraindication.
Pregnancy and conception. Pregnancy is a hard contraindication. Cocaine use during pregnancy is associated with placental abruption, preterm birth, low birth weight, and neonatal neurological effects. Breastfeeding is also a contraindication. Same applies if you're actively trying to conceive.
MAOIs. MAOIs inhibit cocaine's metabolism and can produce hypertensive crisis. This includes ayahuasca, syrian rue, and pharmaceutical MAOIs. The combination is rarely sought out intentionally but is genuinely dangerous when it happens by accident — especially given how many people on retreats or in religious settings may have residual MAOI activity from ayahuasca for days afterward.
Tim's Take
I haven't used cocaine. What I can tell you about it comes from the pharmacology, the harm reduction literature, and watching what it does to people.
First, the forms matter more than people realize. Powder cocaine, what people snort, is cocaine hydrochloride. Crack and freebase are the same cocaine converted into a smokable base. The molecule is the same. What changes is the speed of delivery. Snorting gets you there in five to fifteen minutes and lasts an hour or two. Smoking gets you there in ten seconds and is over in five. That delivery speed is what makes smoked cocaine so much more addictive than snorted. It's not a moral difference between users. It's pharmacology. Fast, intense, short-lived highs produce compulsive use patterns in a way slower onset doesn't, and that's true whether the drug is cocaine, nicotine, or anything else.
Second, the fentanyl contamination problem is real for cocaine in a way it isn't for cannabis. Street cocaine in most of North America now has a non-trivial chance of containing fentanyl, sometimes at doses high enough to kill a person with no opioid tolerance, which is most cocaine users. The "fourth wave" of the opioid crisis is specifically about opioid contamination of stimulant supplies. If you are using cocaine at all, fentanyl test strips are not optional. Naloxone in the room is not optional. Not using alone is not optional. The overdose profile of a cocaine user who hits fentanyl is "dead on the bathroom floor an hour into a night out," because they had no reason to expect respiratory depression and nobody was watching for it.
Third, the cardiovascular risk is the one that kills cocaine users who don't die from contamination. Cocaine constricts blood vessels, raises heart rate and blood pressure simultaneously, and does it acutely enough that otherwise healthy people have heart attacks on it, including on their first use. Alcohol plus cocaine produces cocaethylene in the liver, which is more cardiotoxic than either one alone. The combination kills people who would have been fine on either substance by itself.
My honest read, for what it's worth: cocaine in 2026 isn't carrying a risk profile I'd choose to take on. The contamination issue alone has moved it from a drug with known harms to a drug with unknowable harms. That's my read, not advice. If you're going to use it, test it, don't mix it with alcohol, don't use it alone, and keep naloxone nearby.
If you or someone you know needs support
SAMHSA's helpline is available 24/7 at 1-800-662-4357 — free, confidential, and available in English and Spanish. For immediate medical emergencies, call 911. Good Samaritan laws protect you.
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Know Before You Go
Based on documented risks and harm reduction literature, practitioners typically advise the following.
Test for fentanyl. Every batch. Fentanyl strips cost $1 and save lives. Have naloxone accessible.
Cocaine + alcohol = cocaethylene. Significantly more cardiotoxic than either alone.
Cardiac events are the primary cause of cocaine-related death — not "overdose" in the traditional sense.
~15–20% addiction rate. Short duration drives compulsive redosing. Set your amount before you start.
Chest pain, irregular heartbeat, severe headache while using = call 911. Good Samaritan laws protect you.
SAMHSA: 1-800-662-4357 · 24/7 · Free · Confidential
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