Cocaine · the evidence
Does cocaine affect dopamine?
Grade AHuman imaging or trial evidence with a measured effect
What the research says
Our evidence catalogue links 6 studies to cocaine: 1 meta-analysis, 2 reviews, 2 animal studies and 1 PET imaging study.
The strongest supporting study is Ashok 2017, a meta-analysis of 1031 people published in JAMA Psychiatry. It measured meta-analysis of 31 PET/SPECT case-control studies (519 stimulant users, 512 controls): striatal dopamine release, DAT availability and D2/D3 receptor availability.
In the authors' words: “a significant decrease in D2/D3 receptor availability: the effect size was -0.76 (95% CI, -0.92 to -0.60; P < .001) for stimulants combined”
Evidence grade: A, human imaging or trial evidence with a measured effect.
How the app explains it
Cocaine blocks the dopamine transporter at the axon terminal, so every release from the VTA keeps firing into the NAc long past its natural off-switch. Repeated use is strongly linked to large D2 receptor drops and persistent anhedonia. Tolerance builds quickly and the receptor loss outlasts the drug itself.
Pathway: DAT blockade, D2 downregulation in NAc
This is the mechanism card shown on this habit in the app. It is editorial copy written from the studies below; where it and a study disagree, the study wins.
What this means, and what it doesn't
What it means
- There is published research on how cocaine relates to the brain's reward system, and every study it rests on is listed below with a link.
- At least one human brain-imaging study or trial measured an effect. That is the strongest kind of evidence in this catalogue.
- If cocaine is costing you sleep, focus or time, cutting back and tracking it is a reasonable experiment. How you feel over a few weeks is the result that matters.
What it doesn't
- It does not show that a "dopamine detox" resets anything. None of the studies listed here tested a detox programme.
- It is not a measurement of your brain. The app's score for cocaine is an editorial estimate: studies support the mechanism, they do not validate the number.
- It is not a diagnosis or medical advice. If cocaine feels out of control, a doctor or counsellor can help.
The studies (6)
Every study linked to this habit in our catalogue, including the ones that disagree. Quotes are verbatim from each abstract. How grades are computed
Main study·Meta-analysis · n = 1031
Association of Stimulant Use With Dopaminergic Alterations in Users of Cocaine, Amphetamine, or Methamphetamine: A Systematic Review and Meta-analysis
Ashok 2017, JAMA Psychiatry · doi:10.1001/jamapsychiatry.2017.0135
Measured: Meta-analysis of 31 PET/SPECT case-control studies (519 stimulant users, 512 controls): striatal dopamine release, DAT availability and D2/D3 receptor availability
Reported effect: -0.76 standardized mean difference, striatal D2/D3 receptor availability, stimulant users vs controls (stimulants combined; DA release -0.84, DAT -0.91) (CI -0.92 to -0.6)
“a significant decrease in D2/D3 receptor availability: the effect size was -0.76 (95% CI, -0.92 to -0.60; P < .001) for stimulants combined”
Also cited for: Amphetamines and meth
Supporting·Review
Dopamine dysfunction in stimulant use disorders: mechanistic comparisons and implications for treatment
Kohno 2022, Mol Psychiatry · doi:10.1038/s41380-021-01180-4
Measured: Review comparing dopamine dysfunction in cocaine vs methamphetamine use disorder and treatment implications
“Dopamine system deficiencies and associated behavioral phenotypes may be a critical barrier to success in treating stimulant use disorders.”
Also cited for: Amphetamines and meth
Supporting·Animal study
Comparison of cocaine- and methamphetamine-evoked dopamine and glutamate overflow in somatodendritic and terminal field regions of the rat brain during acute, chronic, and early withdrawal conditions
Zhang 2001, Ann N Y Acad Sci · doi:10.1111/j.1749-6632.2001.tb03560.x
Measured: Extracellular dopamine and glutamate (microdialysis) in caudate putamen, nucleus accumbens, VTA and substantia nigra after acute and chronic methamphetamine (1 mg/kg) or cocaine (10 mg/kg)
“Acute injection of methamphetamine (1 mg/kg of body weight) or cocaine (10 mg/kg) resulted in elevated levels of extracellular dopamine in all brain regions measured, although the magnitude of increase varied between brain regions.”
Also cited for: Amphetamines and meth
Supporting·Animal study
Cocaine increases stimulated dopamine release more in periadolescent than adult rats
Walker 2008, Neurotoxicol Teratol · doi:10.1016/j.ntt.2008.04.002
Measured: Electrically stimulated dopamine release in caudate and nucleus accumbens before/after 15 mg/kg cocaine, periadolescent (PN28) vs adult (PN65) rats
Reported effect: 3 fold increase in stimulated caudate dopamine after cocaine in adult rats (almost 9-fold in periadolescents)
“Cocaine increased dopamine concentrations elicited by 20 Hz stimulations 3-fold in the adult, but almost 9-fold in periadolescent caudate.”
Supporting·Human PET imaging · n = 29
Impulsivity, reward sensitivity, and dopamine 2/3 receptors availability in people with cocaine use disorder: A [ 11 C]PHNO PET study.
Mayeli 2026, Psychiatry research · doi:10.1016/j.psychres.2026.117239
Measured: [11C]PHNO non-displaceable binding potential (BPND) for D2/3 receptor availability across striatal and limbic regions (putamen, pallidum, ventral striatum, caudate, amygdala, thalamus)
“We concluded that CUD is characterized by elevated impulsivity and a disruption of the normative coupling between dopamine D2/3 receptor availability and impulsivity-related features.”
Supporting·Review · n = 887
Post-mortem human brain evidence for presynaptic dopaminergic dysregulation in cocaine use disorder: A systematic review.
Biso 2026, Neuroscience and biobehavioral reviews · doi:10.1016/j.neubiorev.2026.107012
Measured: Presynaptic dopaminergic markers: dopamine transporter (DAT/SLC6A3) binding/immunoreactivity/mRNA, vesicular monoamine transporter 2 (VMAT2/SLC18A2), tyrosine hydroxylase (TH), NR4A2/NURR1, FOXA2, and α-synuclein (SNCA) in striatum, nucleus accumbens, prefrontal cortex, VTA, and substantia nigra
“Dopamine transporter measures (DAT/SLC6A3) were frequently altered, with reports of discordance between striatal binding/immunoreactivity and reduced ventral midbrain DAT mRNA expression.”
Quick answers
- Does cocaine affect dopamine?
- Our evidence catalogue links 6 studies to cocaine: 1 meta-analysis, 2 reviews, 2 animal studies and 1 PET imaging study. The strongest supporting study is Ashok 2017, a meta-analysis of 1031 people published in JAMA Psychiatry. It measured meta-analysis of 31 PET/SPECT case-control studies (519 stimulant users, 512 controls): striatal dopamine release, DAT availability and D2/D3 receptor availability.
- How strong is the evidence on cocaine and dopamine?
- Grade A: human imaging or trial evidence with a measured effect. Grades are computed from each study's design, whether it measured an effect, and any contradicting findings.
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