Modafinil
Modafinil is a benzhydryl-class eugeroic stimulant first developed in France in the late 1970s by neurophysiologist Michel Jouvet and Lafon Laboratories. It is the main metabolite of adrafinil1, with U.S. medical approval granted in 19982. It is prescribed for narcolepsy, sleep apnea, and shift work disorder2, and is also commonly used off-label as a cognitive enhancer because its stimulant profile is relatively subtle compared with traditional stimulantscitation needed.
Dosage & Duration
Dosage
Doses are population estimates that vary widely between individuals.
Duration
Subjective Effects
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Effects vary widely by individual, dose, and context.
Physical
The physical effects of modafinil can be broken down into several components.
Cognitive
The cognitive effects of modafinil can be broken down into several components.
Pharmacology
Pharmacodynamics
The precise mechanism of action of modafinil is not fully understood.2 Its most clearly established pharmacological action is inhibition of the dopamine transporter (DAT), which increases extracellular dopamine concentrations.3 Modafinil also acts as a partial agonist at alpha-1B adrenergic receptors and appears to promote orexin (hypocretin) signaling, activate glutamatergic circuits, and inhibit GABAergic activity.citation needed Elevated concentrations of norepinephrine, serotonin, and histamine have been observed following administration, with some evidence suggesting these increases are secondary to modafinil's dopaminergic and orexinergic actions rather than direct transporter interactions.
Pharmacokinetics
Modafinil has an oral bioavailability of approximately 100% and reaches peak plasma concentrations within 2 to 3 hours of administration.citation needed It is metabolized primarily in the liver, with inactive metabolites excreted renally. Modafinil is a weak to moderate inducer of CYP3A4 and a weak inhibitor of CYP2C19, and may also induce CYP1A2 and CYP2B6 as well as inhibit CYP2C9. It may additionally induce P-glycoprotein. Elimination half-life is generally reported as 10 to 12 hours, though one source cites a broader range of 15 to 60 hours. Individual variation is influenced by sex, cytochrome P450 genotype, and liver and kidney function.
Dangerous
Highest riskThese combinations are considered extremely harmful and should always be avoided. Reactions to these drugs taken in combination are highly unpredictable and have a potential to cause death.
Caution
Use cautionThese combinations are not usually physically harmful, but may produce undesirable effects, such as physical discomfort or overstimulation. Extreme use may cause physical health issues. Synergistic effects may be unpredictable. Care should be taken when choosing to use this combination.
Tolerance
Tolerance timelines are rules of thumb, not exact schedules, and vary widely between individuals and use patterns.
Benzhydryl nootropics (armodafinil, adrafinil), Other eugeroic compounds
Harm Potential
Addiction & Dependence
Psychological
LowModafinil exhibits a low propensity for abuse compared to classical stimulants, as it lacks significantly expressed pleasurable or euphoric effects.citation needed However, emerging evidence suggests it works at similar neurobiological mechanisms as other addictive stimulants,4 warranting some caution.
Physical
LowThe dependence liability of modafinil is considered low.citation needed However, due to its effects on dopamine balance,4 there is some potential for physical dependence with regular use, particularly when consumed for performance enhancement purposes with the intention of functioning on reduced sleep.
Toxicity
Modafinil can cause notable increases in heart rate and blood pressure through effects on autonomic cardiovascular regulation;5 these effects are primarily concerning for individuals with pre-existing cardiac conditions such as hypertension, arrhythmia, or structural heart abnormalities.citation needed
Modafinil can cause slight elevations in aminotransferase enzymes; there is no evidence of serious liver damage when enzyme levels remain within reference ranges.citation needed
Rare but serious cutaneous adverse reactions including Stevens-Johnson syndrome, toxic epidermal necrolysis, and DRESS syndrome have been reported;2 these are uncommon immune-mediated reactions rather than dose-dependent toxicity.
Psychosis Risk
Psychiatric symptoms including psychosis, mania, hallucinations, and delusions may occur, primarily in overdose situations.citation needed These reactions have been reported in individuals both with and without preexisting psychiatric history and may persist after discontinuation of the drug.
Seizure Risk
Seizures are a rare neurological complication that may arise primarily in overdose situations. The risk may be elevated when modafinil is combined with substances that lower the seizure threshold.
History & Culture
Discovery and Development
Modafinil was developed in France by neurophysiology professor Michel Jouvet and Lafon Laboratories.citation needed The compound emerged from research into a series of benzhydryl sulfinyl compounds initiated in the late 1970s. The first of these compounds to reach clinical use…
Legality
International
Not internationally scheduled under the 1961, 1971, or 1988 conventions.
By Country
References
Source Pages
Citations
- Alice Ameline, Laurie Gheddar, Jean-Sébastien Raul, & Pascal Kintz. (2020). Identification of Adrafinil and its Main Metabolite Modafinil in Human Hair. Self-Administration Study and Interpretation of an Authentic Case. Forensic Sciences Research, 5(4), 322–326. https://academic.oup.com/fsr/article/5/4/322/67946351
- Provigil- modafinil tablet. DailyMed (n.d.). https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=e16c26ad-7bc2-d155-3a5d-da83ad6492c812345
- Pharmacological Advances in Central Nervous System Stimulants. 99, 287–326 (2024). https://doi.org/10.1016/bs.apha.2023.10.0061
- Volkow ND, Fowler JS, & Logan J. (2009). Effects of modafinil on dopamine and dopamine transporters in the male human brain: clinical implications. https://pubmed.ncbi.nlm.nih.gov/19293415/12
- Indu Taneja, Andre Diedrich, Bonnie K. Black, Daniel W. Byrne, Sachin Y. Paranjape, & David Robertson. (April 2005). Modafinil elicits sympathomedullary activation. Hypertension, 45(4), 612–8. https://doi.org/10.1161/01.hyp.0000158267.66763.631
- Sleep disruption, use of sleep-promoting medication and circadian desynchronization in spaceflight crewmembers. (n.d.). https://pmc.ncbi.nlm.nih.gov/articles/PMC10391686/1
- Modafinil for the treatment of cocaine dependence. (n.d.). https://pmc.ncbi.nlm.nih.gov/articles/PMC2818032/1
- IFA / authorized medicines database, ANMAT. ifas.anmat.gob.ar (n.d.). https://ifas.anmat.gob.ar/ifas1
- Therapeutic Goods (Poisons Standard—June 2026) Instrument 2026. legislation.gov.au (n.d.). https://www.legislation.gov.au/F2026L00633/asmade/2026-05-28/text/original/pdf1
- NIH PubChem CID 4236 property record — Modafinil. pubchem.ncbi.nlm.nih.gov (n.d.). https://pubchem.ncbi.nlm.nih.gov/rest/pug/compound/name/modafinil/property/IUPACName,Title,CanonicalSMILES,IsomericSMILES,MolecularFormula/JSON1
Further Reading
Article Status
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Recent changes7 human edits · latest
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24 January 2026
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
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