Cocaine

Cocaine at a Glance

Cocaine, chemically benzoylmethylecgonine, is the principal tropane alkaloid of the coca leaf (Erythroxylum coca and E. novogranatense), where it makes up roughly 0.5–1% of leaf dry weight ^{7,17Reference 7Pergolizzi J et al. · 2022Cocaethylene: When Cocaine and Alcohol Are Taken TogetherView study →Reference 17Penny ME et al. · 2009Can coca leaves contribute to improving the nutritional status of the Andean population? Food and Nutrition Bulletin. https://pubmed.ncbi.nlm.nih.gov/19927600/View study →}. It is the molecule responsible for coca’s stimulant, appetite-suppressing and local-numbing effects, and — once isolated and concentrated — it is a controlled substance with high abuse potential.

Its pharmacology is genuinely two-sided, and holding the two halves apart is the point. Cocaine blocks the monoamine reuptake transporters (dopamine, noradrenaline and serotonin), which raises synaptic monoamine levels and produces the central stimulant effect, the sympathomimetic cardiovascular effects, and the powerful reinforcement that drives dependence ^{1,2Reference 1Roque Bravo R et al. · 2022Cocaine: An Updated Overview on Chemistry, Detection, Biokinetics, and Pharmacotoxicological Aspects including Abuse PatternView study →Reference 2Izenwasser S · 2004The role of the dopamine transporter in cocaine abuseView study →}. Separately, it blocks voltage-gated sodium channels, halting nerve-impulse conduction — the property that made it, in 1884, the first effective local anaesthetic, and its one enduring legitimate medical use ^{3,6,10Reference 3Tikhonov DB · 2017Mechanism of sodium channel block by local anesthetics, antiarrhythmics, and anticonvulsantsView study →Reference 6Harper SJ · 2006ReviewCocaine: what role does it have in current ENT practice? A review of the current literatureView study →Reference 10Goerig M et al. · 2012Carl Koller, cocaine, and local anesthesia: some less known and forgotten factsView study →}.

This page is a scholarly pharmacology and toxicology reference. It does not cover recreational use, routes of administration, or any preparation method. It states the harms — cardiovascular toxicity, seizure and stroke risk, addiction, and reproductive harm — plainly, because they are the dominant clinical facts about the isolated molecule ^{1,5Reference 1Roque Bravo R et al. · 2022Cocaine: An Updated Overview on Chemistry, Detection, Biokinetics, and Pharmacotoxicological Aspects including Abuse PatternView study →Reference 5Havakuk O et al. · 2017The Cardiovascular Effects of CocaineView study →}.

Cocaine’s Dual Signature: Reuptake Blockade & Sodium-Channel Block

Almost everything cocaine does traces to two mechanistically independent actions in the same molecule, and the coca leaf is where it comes from.

1. Monoamine reuptake blockade (the stimulant/sympathomimetic action). Cocaine binds the presynaptic dopamine transporter (DAT), noradrenaline transporter (NET) and serotonin transporter (SERT), preventing reuptake of these neurotransmitters back into the nerve terminal so they accumulate in the synapse ^{1,2Reference 1Roque Bravo R et al. · 2022Cocaine: An Updated Overview on Chemistry, Detection, Biokinetics, and Pharmacotoxicological Aspects including Abuse PatternView study →Reference 2Izenwasser S · 2004The role of the dopamine transporter in cocaine abuseView study →}. Elevated dopamine in the mesolimbic reward pathway underlies the euphoria and the intense reinforcement behind dependence; elevated noradrenaline drives the sympathomimetic surge — raised heart rate, raised blood pressure, and vasoconstriction — that underlies much of the cardiovascular toxicity ^{1,5Reference 1Roque Bravo R et al. · 2022Cocaine: An Updated Overview on Chemistry, Detection, Biokinetics, and Pharmacotoxicological Aspects including Abuse PatternView study →Reference 5Havakuk O et al. · 2017The Cardiovascular Effects of CocaineView study →}.

2. Voltage-gated sodium-channel block (the local-anaesthetic action). Independently of any transporter, cocaine blocks voltage-gated Na⁺ channels in excitable membranes, stopping the rise of the action potential and so blocking nerve conduction ^{3,4Reference 3Tikhonov DB · 2017Mechanism of sodium channel block by local anesthetics, antiarrhythmics, and anticonvulsantsView study →Reference 4Wood JN · 2025Sensory neuron sodium channels as pain targets; from cocaine to Journavx (VX-548, suzetrigine)View study →}. On a peripheral sensory nerve this produces local anaesthesia; in cardiac muscle the same Na⁺-channel block slows conduction in a class-I-antiarrhythmic-like way that, at toxic levels, becomes pro-arrhythmic ^{1,5Reference 1Roque Bravo R et al. · 2022Cocaine: An Updated Overview on Chemistry, Detection, Biokinetics, and Pharmacotoxicological Aspects including Abuse PatternView study →Reference 5Havakuk O et al. · 2017The Cardiovascular Effects of CocaineView study →}. Cocaine is historically important precisely because it was the first compound whose Na⁺-channel block was harnessed clinically — a lineage that runs from cocaine to modern local anaesthetics and, most recently, to selective Naᵥ1.8 pain drugs ^{4Reference 4Wood JN · 2025Sensory neuron sodium channels as pain targets; from cocaine to Journavx (VX-548, suzetrigine)View study →}.

The combination is what makes cocaine distinctive: a reuptake-blocking stimulant that is also a membrane-stabilising local anaesthetic and vasoconstrictor. The two mechanisms even converge on the heart — noradrenaline-driven vasospasm and tachycardia on one side, Na⁺-channel conduction block on the other — which is why cardiotoxicity is the signature danger ^{5Reference 5Havakuk O et al. · 2017The Cardiovascular Effects of CocaineView study →}.

Established Medical Use: Topical Local Anaesthesia

Cocaine’s one legitimate, still-current clinical role is as a topical local anaesthetic and vasoconstrictor for the mucous membranes of the ear, nose and throat ^{6Reference 6Harper SJ · 2006ReviewCocaine: what role does it have in current ENT practice? A review of the current literatureView study →}. Applied to nasal or airway mucosa it delivers two useful effects at once from the two mechanisms above: Na⁺-channel block numbs the tissue, while NET blockade causes local vasoconstriction that shrinks the mucosa and reduces bleeding — a uniquely convenient pairing for nasal and sinus surgery and for airway instrumentation ^{6Reference 6Harper SJ · 2006ReviewCocaine: what role does it have in current ENT practice? A review of the current literatureView study →}.

This role is now niche. Cocaine has largely been superseded by safer synthetic local anaesthetics (lidocaine and relatives, often combined with a separate vasoconstrictor such as adrenaline), because cocaine itself is systemically toxic, tightly controlled, and offers no anaesthetic advantage over the modern agents ^{6Reference 6Harper SJ · 2006ReviewCocaine: what role does it have in current ENT practice? A review of the current literatureView study →}. Where it is retained, it is a physician-administered ENT preparation used under a defined maximum safe dose — not an oral or systemic medicine.

What It's Used For

Cocaine is one of the most intensively studied psychoactive molecules in pharmacology, so — unusually for a plant constituent — the mechanism is defined at the molecular level in the isolate, not inferred from whole-plant work. The honest framing is that its best-characterised “applications” are a legitimate topical anaesthetic and a mechanistically definitive stimulant pharmacology that is not a therapy — the same reuptake blockade that makes it a stimulant is what makes it addictive and cardiotoxic ^{1,2,5Reference 1Roque Bravo R et al. · 2022Cocaine: An Updated Overview on Chemistry, Detection, Biokinetics, and Pharmacotoxicological Aspects including Abuse PatternView study →Reference 2Izenwasser S · 2004The role of the dopamine transporter in cocaine abuseView study →Reference 5Havakuk O et al. · 2017The Cardiovascular Effects of CocaineView study →}.

Evidence by IndicationStrength of support · Beta

Support is an experimental score — weighted by study type (human > animal > in vitro) and volume — and here it tracks how well characterised an action is, not an endorsement. Cocaine has one legitimate application; the stimulant and anorectic rows describe pharmacology, not recommended uses.

01Topical local anaesthesia / vasoconstriction (ENT)Promising60%Established (if niche) clinical use; defined Na⁺-channel + vasoconstrictor mechanism ^{3,6Reference 3Tikhonov DB · 2017Mechanism of sodium channel block by local anesthetics, antiarrhythmics, and anticonvulsantsView study →Reference 6Harper SJ · 2006ReviewCocaine: what role does it have in current ENT practice? A review of the current literatureView study →}

02Central stimulant pharmacology (monoamine reuptake block)Promising54%Molecularly definitive DAT/NET/SERT mechanism — but a driver of harm, not a therapy ^{1,2Reference 1Roque Bravo R et al. · 2022Cocaine: An Updated Overview on Chemistry, Detection, Biokinetics, and Pharmacotoxicological Aspects including Abuse PatternView study →Reference 2Izenwasser S · 2004The role of the dopamine transporter in cocaine abuseView study →}

03Appetite suppression (anorectic)Shaky28%Plausible dopaminergic/noradrenergic mechanism + coca tradition; no controlled isolate trial ^{9,16Reference 9Warner A · 2000In vitroMechanisms of cocaine hydrolysis and metabolism in vitro and in vivo: a clarificationView study →Reference 16Novák M et al. · 1984Biological activity of the alkaloids of Erythroxylum coca and Erythroxylum novogranatenseView study →}

Mechanisms

The load-bearing point is that the reuptake block (DAT/NET/SERT) and the Na⁺-channel block are separate mechanisms that happen to coexist in one molecule — the first explains the stimulant/addictive/sympathomimetic profile, the second the anaesthetic use and part of the cardiac toxicity ^{1,3,5Reference 1Roque Bravo R et al. · 2022Cocaine: An Updated Overview on Chemistry, Detection, Biokinetics, and Pharmacotoxicological Aspects including Abuse PatternView study →Reference 3Tikhonov DB · 2017Mechanism of sodium channel block by local anesthetics, antiarrhythmics, and anticonvulsantsView study →Reference 5Havakuk O et al. · 2017The Cardiovascular Effects of CocaineView study →}.

Pharmacokinetics

Cocaine is a lipophilic weak base that is absorbed across mucous membranes and the gut, distributes rapidly into the brain, and has a short elimination half-life — on the order of about an hour ^{1Reference 1Roque Bravo R et al. · 2022Cocaine: An Updated Overview on Chemistry, Detection, Biokinetics, and Pharmacotoxicological Aspects including Abuse PatternView study →}. It is cleared mainly by ester hydrolysis rather than oxidation: plasma and hepatic carboxylesterases and butyrylcholinesterase cleave it to two major inactive metabolites, benzoylecgonine and ecgonine methyl ester, which together account for the bulk of a dose ^{9,1Reference 9Warner A · 2000In vitroMechanisms of cocaine hydrolysis and metabolism in vitro and in vivo: a clarificationView study →Reference 1Roque Bravo R et al. · 2022Cocaine: An Updated Overview on Chemistry, Detection, Biokinetics, and Pharmacotoxicological Aspects including Abuse PatternView study →}. A minor oxidative pathway via CYP3A4 produces norcocaine, a hepatotoxic metabolite ^{1Reference 1Roque Bravo R et al. · 2022Cocaine: An Updated Overview on Chemistry, Detection, Biokinetics, and Pharmacotoxicological Aspects including Abuse PatternView study →}. Benzoylecgonine is the stable urinary marker targeted by standard cocaine drug screens and is detectable for roughly 2–4 days after exposure — which is also why chewing coca leaf or drinking coca tea yields a positive urine test ^{19Reference 19Jenkins AJ et al. · 1996Identification and quantitation of alkaloids in coca teaView study →}. Two metabolic points are distinctive: (1) when cocaine and ethanol are present together, hepatic carboxylesterase performs a transesterification to cocaethylene, a pharmacologically active and more cardiotoxic metabolite (see below) ^{8,23Reference 8Laizure SC et al. · 2003Cocaethylene metabolism and interaction with cocaine and ethanol: role of carboxylesterasesView study →Reference 23Farooq MU et al. · 2009Neurotoxic and cardiotoxic effects of cocaine and ethanolView study →}; and (2) because clearance depends on esterase activity, individuals with low cholinesterase capacity may metabolise it more slowly ^{9Reference 9Warner A · 2000In vitroMechanisms of cocaine hydrolysis and metabolism in vitro and in vivo: a clarificationView study →}.

Clinical Trials

There are no ongoing efficacy trials of cocaine as a therapeutic — its topical anaesthetic role is established historical clinical practice rather than a trial programme, and the large clinical-research effort instead targets cocaine-use disorder, where no medication is approved for dependence. Systematic reviews of candidate pharmacotherapies (dopamine agonists, and a range of other agents) have been largely negative ^{11,12Reference 11Karila L et al. · 2008ReviewNew treatments for cocaine dependence: a focused reviewView study →Reference 12Minozzi S et al. · 2015Systematic reviewDopamine agonists for the treatment of cocaine dependenceView study →}.

Last checked: July 2026.

Cocaethylene — When Cocaine Meets Alcohol

A metabolic quirk with real clinical weight. When cocaine and ethanol are taken together, liver carboxylesterase diverts part of the cocaine to cocaethylene (ethylbenzoylecgonine) by swapping the methyl ester for an ethyl ester ^{8,23Reference 8Laizure SC et al. · 2003Cocaethylene metabolism and interaction with cocaine and ethanol: role of carboxylesterasesView study →Reference 23Farooq MU et al. · 2009Neurotoxic and cardiotoxic effects of cocaine and ethanolView study →}. Cocaethylene is itself an active monoamine-reuptake blocker with a longer half-life than cocaine and greater cardiotoxicity, and its formation is associated with an increased risk of cardiac and neurological injury and sudden death relative to cocaine alone ^{7,23Reference 7Pergolizzi J et al. · 2022Cocaethylene: When Cocaine and Alcohol Are Taken TogetherView study →Reference 23Farooq MU et al. · 2009Neurotoxic and cardiotoxic effects of cocaine and ethanolView study →}. It is a clear example of a drug–drug interaction that produces a new, more dangerous molecule rather than simply adding two effects.

Its Role in the Plant

In coca, cocaine is an end-product of the tropane alkaloid pathway. Biosynthesis proceeds from the amino acids ornithine/arginine → putrescine → N-methylputrescine, through the N-methyl-Δ¹-pyrrolinium cation, into the tropane skeleton; the pathway’s enzymatic steps in Erythroxylum coca were substantially elucidated using a microbial pathway-reconstruction platform, confirming the route to methylecgonine and its benzoylation to cocaine ^{14,16Reference 14Chavez BG et al. · 2022Elucidation of tropane alkaloid biosynthesis in Erythroxylum coca using a microbial pathway discovery platformView study →Reference 16Novák M et al. · 1984Biological activity of the alkaloids of Erythroxylum coca and Erythroxylum novogranatenseView study →}. The leaf also stores cocaine in a controlled way, with hydroxycinnamoyl-quinate chemistry implicated in cocaine storage and turnover in E. coca tissue ^{15Reference 15Torre JC et al. · 2013The biosynthesis of hydroxycinnamoyl quinate esters and their role in the storage of cocaine in Erythroxylum cocaView study →}. Ecologically, the tropane alkaloids — cocaine chief among them — function in chemical defence, deterring herbivores, consistent with the broader defensive role of alkaloids across the genus ^{16Reference 16Novák M et al. · 1984Biological activity of the alkaloids of Erythroxylum coca and Erythroxylum novogranatenseView study →}.

Notably, coca reaches cocaine via a convergent, biosynthetically distinct route from the tropane alkaloids of the nightshades (Atropa, Datura): both families make tropanes, but the Erythroxylum pathway is independent of the Solanaceae one — a case of parallel evolution of the same alkaloid class ^{14Reference 14Chavez BG et al. · 2022Elucidation of tropane alkaloid biosynthesis in Erythroxylum coca using a microbial pathway discovery platformView study →}.

Prevalence in Nature

Cocaine is essentially confined to the genus Erythroxylum, and in commercial terms to the two cultivated species, E. coca (Bolivian/Huánuco types) and E. novogranatense (Colombian and Trujillo types), across four classical varieties plus a wider set of cocaine-bearing cultigens ^{15,21Reference 15Torre JC et al. · 2013The biosynthesis of hydroxycinnamoyl quinate esters and their role in the storage of cocaine in Erythroxylum cocaView study →Reference 21Casale JF et al. · 2014Chemosystematic identification of fifteen new cocaine-bearing Erythroxylum cultigens grown in Colombia for illicit cocaine productionView study →}. In the leaf it is the dominant alkaloid among some 18 identified tropane, pyrrolidine and pyridine alkaloids, typically 0.5–1% of dry weight — around 0.56 g/100 g in Peruvian E. coca assays ^{7,17Reference 7Pergolizzi J et al. · 2022Cocaethylene: When Cocaine and Alcohol Are Taken TogetherView study →Reference 17Penny ME et al. · 2009Can coca leaves contribute to improving the nutritional status of the Andean population? Food and Nutrition Bulletin. https://pubmed.ncbi.nlm.nih.gov/19927600/View study →}. Content varies strongly by variety, growing region (e.g. Yungas vs. Chapare) and post-harvest handling; liquid preservatives used on herbarium specimens can leach cocaine out and cause under-reporting, so measured figures are method-dependent ^{20,21Reference 20Balick MJ et al. · 1982The effects of field preservation on alkaloid content of fresh coca leaves (Erythroxylum spp.)View study →Reference 21Casale JF et al. · 2014Chemosystematic identification of fifteen new cocaine-bearing Erythroxylum cultigens grown in Colombia for illicit cocaine productionView study →}.

The seed alkaloid profile differs from the leaf and is not the consumed part ^{22Reference 22Casale JF et al. · 2005Alkaloid content of the seeds from Erythroxylum coca var. cocaView study →}. Old World Erythroxylum species are generally cocaine-free and are not sources of the drug ^{21Reference 21Casale JF et al. · 2014Chemosystematic identification of fifteen new cocaine-bearing Erythroxylum cultigens grown in Colombia for illicit cocaine productionView study →}. The minor accompanying tropanes — cinnamoylcocaine, benzoylecgonine, ecgonine methyl ester and tropine among them — are used chemotaxonomically to tell Erythroxylum varieties apart ^{21,22Reference 21Casale JF et al. · 2014Chemosystematic identification of fifteen new cocaine-bearing Erythroxylum cultigens grown in Colombia for illicit cocaine productionView study →Reference 22Casale JF et al. · 2005Alkaloid content of the seeds from Erythroxylum coca var. cocaView study →}.

Discovery & Synthesis

Cocaine’s isolation is a landmark of nineteenth-century alkaloid chemistry. A crude alkaloid was first obtained from coca leaves by Friedrich Gaedcke in 1855 (he called it “erythroxyline”); the pure crystalline alkaloid was isolated and named “cocaine” by Albert Niemann in 1860, working in Friedrich Wöhler’s laboratory at Göttingen. Its structure — an ecgonine benzoate methyl ester — was later resolved by Richard Willstätter, who also achieved the first total synthesis of the tropane framework around the turn of the twentieth century (historical synthesis; no method is described here).

Its pivotal medical moment came in 1884, when Carl Koller, a young Viennese ophthalmologist (encouraged in the circle around Sigmund Freud, whose own interest in coca is well documented), demonstrated that cocaine anaesthetised the eye topically, permitting painless surgery — the birth of local anaesthesia ^{10Reference 10Goerig M et al. · 2012Carl Koller, cocaine, and local anesthesia: some less known and forgotten factsView study →}. Koller’s discovery drove the search for safer synthetic analogues and led, within decades, to procaine, lidocaine and the whole modern local-anaesthetic class, all built on the Na⁺-channel-blocking principle cocaine first revealed ^{4,10Reference 4Wood JN · 2025Sensory neuron sodium channels as pain targets; from cocaine to Journavx (VX-548, suzetrigine)View study →Reference 10Goerig M et al. · 2012Carl Koller, cocaine, and local anesthesia: some less known and forgotten factsView study →}.

Cocaine used medically today is obtained by extraction from coca leaf under strict regulatory control rather than by synthesis, and it remains a controlled substance in manufacture and supply.

Patents: not yet researched.

Legal Status

Cocaine is a controlled substance internationally and in national law, reflecting a recognised (narrow) medical use alongside a high potential for abuse and dependence:

• United States: a DEA Schedule II controlled substance — accepted medical use (as a topical anaesthetic) together with a high abuse potential and risk of severe dependence.
• International: controlled under the 1961 Single Convention on Narcotic Drugs, which places coca leaf and cocaine under strict international scheduling, permitting tightly regulated medical and scientific use only.
• United Kingdom / many others: a Class A (or equivalent) controlled drug with a limited medical exemption for the topical anaesthetic preparation.

Because the coca leaf itself delivers absorbable cocaine, coca leaf and coca tea are also controlled in most jurisdictions, and their consumption produces a positive drug screen ^{19Reference 19Jenkins AJ et al. · 1996Identification and quantitation of alkaloids in coca teaView study →}.

Toxicity & Safety

Cocaine carries a poisonous flag. It is acutely cardiotoxic, lowers the seizure threshold, is strongly addictive, and is a recognised reproductive and developmental toxin — and its toxicity margin narrows sharply when combined with alcohol (via cocaethylene) ^{5,8,13Reference 5Havakuk O et al. · 2017The Cardiovascular Effects of CocaineView study →Reference 8Laizure SC et al. · 2003Cocaethylene metabolism and interaction with cocaine and ethanol: role of carboxylesterasesView study →Reference 13Frank DA et al. · 2001Systematic reviewGrowth, development, and behavior in early childhood following prenatal cocaine exposure: a systematic reviewView study →}.

Cardiovascular Toxicity

The dominant acute danger. Through combined noradrenergic sympathomimetic drive and coronary vasoconstriction/vasospasm, cocaine can precipitate myocardial infarction — including in young people with normal coronary arteries — while the Na⁺-channel block slows cardiac conduction and promotes arrhythmias; reported events include tachyarrhythmias, QRS widening, aortic dissection, accelerated atherosclerosis and sudden cardiac death ^{5Reference 5Havakuk O et al. · 2017The Cardiovascular Effects of CocaineView study →}. Cocaine-associated chest pain and MI are a well-recognised emergency presentation, and beta-blocker use in that setting is classically cautioned ^{5Reference 5Havakuk O et al. · 2017The Cardiovascular Effects of CocaineView study →}.

Neurological & Psychiatric Toxicity

Cocaine lowers the seizure threshold and can cause seizures, and its vasoconstrictor/hypertensive effects are linked to ischaemic and haemorrhagic stroke and to reversible cerebral vasoconstriction syndrome ^{1,5Reference 1Roque Bravo R et al. · 2022Cocaine: An Updated Overview on Chemistry, Detection, Biokinetics, and Pharmacotoxicological Aspects including Abuse PatternView study →Reference 5Havakuk O et al. · 2017The Cardiovascular Effects of CocaineView study →}. Acute intoxication can produce agitation, hyperthermia, anxiety and, with heavy use, paranoia and psychosis ^{1Reference 1Roque Bravo R et al. · 2022Cocaine: An Updated Overview on Chemistry, Detection, Biokinetics, and Pharmacotoxicological Aspects including Abuse PatternView study →}.

Addiction & Dependence

Cocaine is strongly reinforcing — the DAT-mediated dopamine surge is the neurobiological basis of a high dependence liability ^{2Reference 2Izenwasser S · 2004The role of the dopamine transporter in cocaine abuseView study →}. Cocaine-use disorder is common, relapsing and difficult to treat: no medication is approved for it, and systematic reviews of candidate pharmacotherapies (including dopamine agonists) have been largely negative, leaving psychosocial/behavioural treatment as the mainstay ^{11,12Reference 11Karila L et al. · 2008ReviewNew treatments for cocaine dependence: a focused reviewView study →Reference 12Minozzi S et al. · 2015Systematic reviewDopamine agonists for the treatment of cocaine dependenceView study →}.

Reproductive & Developmental Toxicity

Cocaine crosses the placenta and is a recognised perinatal toxin. Prenatal exposure is associated with placental abruption, reduced fetal growth and preterm birth, and — after careful separation from confounders such as tobacco, alcohol and social environment — a systematic review found detectable but comparatively modest independent effects on early-childhood growth, cognition and behaviour, with some outcomes better explained by co-exposures than by cocaine alone ^{13Reference 13Frank DA et al. · 2001Systematic reviewGrowth, development, and behavior in early childhood following prenatal cocaine exposure: a systematic reviewView study →}. Cocaine and its metabolites also pass into breast milk. Because meaningful exposure to the alkaloid is harmful in pregnancy and lactation and no safe level is established, avoidance is the only defensible position; the specific intake decision belongs to the coca monograph, not to this molecule page.

Cocaethylene & Polydrug Risk

Combining cocaine with alcohol forms cocaethylene, a longer-acting, more cardiotoxic metabolite that raises the risk of cardiac and neurological injury and death above cocaine alone ^{8,23Reference 8Laizure SC et al. · 2003Cocaethylene metabolism and interaction with cocaine and ethanol: role of carboxylesterasesView study →Reference 23Farooq MU et al. · 2009Neurotoxic and cardiotoxic effects of cocaine and ethanolView study →}. This is the clearest single-interaction warning for the molecule.

Safety at a Glance

☠️ PoisonousControlled substance

• One legitimate use, under a doctor. As a physician-applied topical ENT/nasal local anaesthetic and vasoconstrictor, at a defined maximum dose — a niche role largely displaced by safer synthetics ^{6Reference 6Harper SJ · 2006ReviewCocaine: what role does it have in current ENT practice? A review of the current literatureView study →}.
• Cardiotoxic. Myocardial infarction (even in young, normal-artery patients), arrhythmia, coronary/cerebral vasospasm, aortic dissection and sudden death from combined sympathomimetic + Na⁺-channel effects ^{5Reference 5Havakuk O et al. · 2017The Cardiovascular Effects of CocaineView study →}.
• Strongly addictive, no approved treatment. High dependence liability via dopamine-transporter blockade; no medication is approved for cocaine-use disorder and drug-treatment trials have been largely negative ^{2,11,12Reference 2Izenwasser S · 2004The role of the dopamine transporter in cocaine abuseView study →Reference 11Karila L et al. · 2008ReviewNew treatments for cocaine dependence: a focused reviewView study →Reference 12Minozzi S et al. · 2015Systematic reviewDopamine agonists for the treatment of cocaine dependenceView study →}.
• Lowers the seizure threshold and raises stroke risk. Seizures, ischaemic/haemorrhagic stroke and agitation/psychosis occur in intoxication ^{1,5Reference 1Roque Bravo R et al. · 2022Cocaine: An Updated Overview on Chemistry, Detection, Biokinetics, and Pharmacotoxicological Aspects including Abuse PatternView study →Reference 5Havakuk O et al. · 2017The Cardiovascular Effects of CocaineView study →}.
• Alcohol makes it worse. Co-use forms cocaethylene, a longer-acting and more cardiotoxic metabolite ^{8,23Reference 8Laizure SC et al. · 2003Cocaethylene metabolism and interaction with cocaine and ethanol: role of carboxylesterasesView study →Reference 23Farooq MU et al. · 2009Neurotoxic and cardiotoxic effects of cocaine and ethanolView study →}.
• Reproductive/perinatal harm. Crosses the placenta and enters breast milk; associated with placental abruption, reduced fetal growth and developmental effects — no safe level established ^{13Reference 13Frank DA et al. · 2001Systematic reviewGrowth, development, and behavior in early childhood following prenatal cocaine exposure: a systematic reviewView study →}.

Dosage

No recreational dose is provided, and cocaine has no oral therapeutic dose. Its only current legitimate dosing is as a physician-administered topical local anaesthetic on ENT/nasal mucosa, applied in defined low-percentage solutions or paste and kept under a maximum safe topical limit (commonly cited around 1.5–3 mg/kg to limit systemic absorption) ^{6Reference 6Harper SJ · 2006ReviewCocaine: what role does it have in current ENT practice? A review of the current literatureView study →}. Historically it was also used as a 1–4% ophthalmic solution for topical eye anaesthesia after Koller’s 1884 introduction, a use long since replaced by safer agents ^{10Reference 10Goerig M et al. · 2012Carl Koller, cocaine, and local anesthesia: some less known and forgotten factsView study →}.

Herbal exposure is indirect. The chewed coca leaf or coca tea delivers a low, slowly-rising blood cocaine level — on the order of tens of ng/mL (about 72 ng/mL after chewing ~12 g of leaf) — rather than the sharp peak of the concentrated drug, because leaf runs only ~0.5–1% cocaine and only a fraction is absorbed ^{17,18Reference 17Penny ME et al. · 2009Can coca leaves contribute to improving the nutritional status of the Andean population? Food and Nutrition Bulletin. https://pubmed.ncbi.nlm.nih.gov/19927600/View study →Reference 18Spielvogel H et al. · 1996Effects of coca chewing on metabolic and hormonal changes during graded incremental exercise to maximumView study →}. This still delivers a psychoactive, cardioactive, dependence-liable alkaloid and still produces a positive drug test ^{19Reference 19Jenkins AJ et al. · 1996Identification and quantitation of alkaloids in coca teaView study →}.

These are clinical/pharmacological reference figures, not a personal recommendation, and cocaine is a controlled substance whose use outside a strictly regulated medical setting is illegal.

References

1. Roque Bravo R, et al. (2022). Cocaine: An Updated Overview on Chemistry, Detection, Biokinetics, and Pharmacotoxicological Aspects including Abuse Pattern. Toxins (Basel). https://pubmed.ncbi.nlm.nih.gov/35448887/
2. Izenwasser S (2004). The role of the dopamine transporter in cocaine abuse. Neurotoxicity Research. https://pubmed.ncbi.nlm.nih.gov/15545021/
3. Tikhonov DB, Zhorov BS (2017). Mechanism of sodium channel block by local anesthetics, antiarrhythmics, and anticonvulsants. Journal of General Physiology. https://pubmed.ncbi.nlm.nih.gov/28258204/
4. Wood JN, Yan N (2025). Sensory neuron sodium channels as pain targets; from cocaine to Journavx (VX-548, suzetrigine). Journal of General Physiology. https://pubmed.ncbi.nlm.nih.gov/40294084/
5. Havakuk O, Rezkalla SH, Kloner RA (2017). The Cardiovascular Effects of Cocaine. Journal of the American College of Cardiology. https://pubmed.ncbi.nlm.nih.gov/28662796/
6. Harper SJ, Jones NS (2006). Cocaine: what role does it have in current ENT practice? A review of the current literature. Journal of Laryngology and Otology. https://pubmed.ncbi.nlm.nih.gov/16848922/
7. Pergolizzi J, et al. (2022). Cocaethylene: When Cocaine and Alcohol Are Taken Together. Cureus. https://pubmed.ncbi.nlm.nih.gov/35345678/
8. Laizure SC, et al. (2003). Cocaethylene metabolism and interaction with cocaine and ethanol: role of carboxylesterases. Drug Metabolism and Disposition. https://pubmed.ncbi.nlm.nih.gov/12485948/
9. Warner A, Norman AB (2000). Mechanisms of cocaine hydrolysis and metabolism in vitro and in vivo: a clarification. Therapeutic Drug Monitoring. https://pubmed.ncbi.nlm.nih.gov/10850392/
10. Goerig M, Bacon D, van Zundert A (2012). Carl Koller, cocaine, and local anesthesia: some less known and forgotten facts. Regional Anesthesia and Pain Medicine. https://pubmed.ncbi.nlm.nih.gov/22531385/
11. Karila L, et al. (2008). New treatments for cocaine dependence: a focused review. International Journal of Neuropsychopharmacology. https://pubmed.ncbi.nlm.nih.gov/17927843/
12. Minozzi S, et al. (2015). Dopamine agonists for the treatment of cocaine dependence. Cochrane Database of Systematic Reviews. https://pubmed.ncbi.nlm.nih.gov/26014366/
13. Frank DA, et al. (2001). Growth, development, and behavior in early childhood following prenatal cocaine exposure: a systematic review. JAMA. https://pubmed.ncbi.nlm.nih.gov/11268270/
14. Chavez BG, et al. (2022). Elucidation of tropane alkaloid biosynthesis in Erythroxylum coca using a microbial pathway discovery platform. Proceedings of the National Academy of Sciences USA. https://pubmed.ncbi.nlm.nih.gov/36442128/
15. Torre JC, Schmidt GW, et al. (2013). The biosynthesis of hydroxycinnamoyl quinate esters and their role in the storage of cocaine in Erythroxylum coca. Phytochemistry. https://pubmed.ncbi.nlm.nih.gov/23089134/
16. Novák M, Salemink CA, Khan I (1984). Biological activity of the alkaloids of Erythroxylum coca and Erythroxylum novogranatense. Journal of Ethnopharmacology. https://pubmed.ncbi.nlm.nih.gov/6379304/
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