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Modafinil

Modafinil molecule structureModafinil molecule structure
Provigil, Alertec, Modavigil, Modiodal, Modalert

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.

Threshold~50 mg
Light50-100 mg
Moderate100-200 mg
Strong200-300 mg
Heavy300+ mg
Bioavailability
~100%

Duration

Onset60-120 minutes
Peak2-4 hours
Offset4-8 hours
After Effects1-12 hours
Total10-15 hours
Half-life
10-12 hours

Subjective Effects

Legacy content. A statistically backed ontology from Mindstate Design Labs is coming soon.

Effects vary widely by individual, dose, and context.

Physical

The physical effects of modafinil can be broken down into several components.

Increased heart rateDizzinessNausea

Cognitive

The cognitive effects of modafinil can be broken down into several components.

Forked from Subjective Effect Documentation byJosie Kins August 2015.

Reagent Testing

Expected colorimetric results for common reagent tests. Colors show reaction change over 1–2 minutes.

Marquis(MQ)
white → yellow2 → orange2 → brown2
Mecke(ME)
white → orange2 → brown2
Mandelin(MD)
yellow2 → red3
Liebermann(LB)
white → orange2 → orange3
Powered by PROtestkit.eu

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.

Metabolitesnone documented yet

Interactions

Dangerous

Highest risk

These 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.

AlcoholCYP2C19-substratesDXMDissociativesHormonal Birth ControlMAOIsMDMAMXENBOMe compoundsStimulantsTramadol

Caution

Use caution

These 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.

AbametapirAbataceptAbemaciclibAbrocitinibAcalabrutinib
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Tolerance

Tolerance timelines are rules of thumb, not exact schedules, and vary widely between individuals and use patterns.

Full Tolerance
Many modafinil effects may become less pronounced after prolonged repeated use, leading some users to require larger doses for similar results.
Baseline Reset
1-2 weeks
Half Tolerance
3-7 days
Cross Tolerance

Benzhydryl nootropics (armodafinil, adrafinil), Other eugeroic compounds

Harm Potential

Addiction & Dependence

Psychological

Low

Modafinil 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

Low

The 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

Cardiovascular

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

Hepatic

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

Integumentary

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

Controlled / restricted8
United States flagUnited StatesRestricted
China flagChinaRestricted
Japan flagJapanRestricted
Romania flagRomaniaRestricted
Russia flagRussiaRestricted
Russian Federation flagRussian FederationRestricted
Singapore flagSingaporeRestricted
Sweden flagSwedenRestricted
Prescription20
Australia flagAustraliaPrescription only
Austria flagAustriaPrescription only
Belgium flagBelgiumPrescription only
Brazil flagBrazilPrescription only
Canada flagCanadaPrescription only
Chile flagChilePrescription only
Czech Republic flagCzech RepublicPrescription only
Denmark flagDenmarkPrescription only
France flagFrancePrescription only
Germany flagGermanyPrescription only
Ireland flagIrelandPrescription only
Italy flagItalyPrescription only
Netherlands flagNetherlandsPrescription only
New Zealand flagNew ZealandPrescription only
Norway flagNorwayPrescription only
South Korea flagSouth KoreaPrescription only
Spain flagSpainPrescription only
Switzerland flagSwitzerlandPrescription only
Turkey flagTurkeyPrescription only
United Kingdom flagUnited KingdomPrescription only
Legal / decriminalized2
Argentina flagArgentinaLegal (regulated)
Finland flagFinlandLegal (regulated)
Not scheduled1
Mexico flagMexicoNot scheduled

References

Source Pages

  1. Drug Users Bible by Dominic Milton Trott
  2. DrugBank
  3. DrugBank: Modafinil absorption and metabolism
  4. DrugBank: Modafinil mechanism of action
  5. Erowid
  6. Erowid: Modafinil Effects
  7. Isomer Design (TiHKAL/PiHKAL)
  8. PsychonautWiki
  9. The Drug Classroom
  10. TripSit Factsheets

Citations

  1. 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
  2. Provigil- modafinil tablet. DailyMed (n.d.). https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=e16c26ad-7bc2-d155-3a5d-da83ad6492c812345
  3. Pharmacological Advances in Central Nervous System Stimulants. 99, 287–326 (2024). https://doi.org/10.1016/bs.apha.2023.10.0061
  4. 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
  5. 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
  6. Sleep disruption, use of sleep-promoting medication and circadian desynchronization in spaceflight crewmembers. (n.d.). https://pmc.ncbi.nlm.nih.gov/articles/PMC10391686/1
  7. Modafinil for the treatment of cocaine dependence. (n.d.). https://pmc.ncbi.nlm.nih.gov/articles/PMC2818032/1
  8. IFA / authorized medicines database, ANMAT. ifas.anmat.gob.ar (n.d.). https://ifas.anmat.gob.ar/ifas1
  9. 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
  10. 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

  1. Drugs.com: Modafinil Monograph
  2. NCBI: Modafinil StatPearls

Article Status

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    No one has reviewed this article's citations yet. That second pass checks each claim against the source it cites.

Recent changes7 human edits · latest

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24 January 2026

  1. Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more

  2. Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more

  3. Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more

  4. Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more

  5. Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more

  6. Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more

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