Modafinil
Provigil · Wakefulness agent (eugeroic)
What it is
A prescription wakefulness-promoting drug developed for narcolepsy, shift-work disorder, and sleep apnea. Widely used off-label as a cognitive enhancer, particularly for sustained attention under sleep deprivation.
What human evidence shows
Trial evidence exists for maintaining alertness and attention in sleep-deprived people (military and medical-shift studies). In well-rested users, meta-analyses show modest benefits to attention and executive function on longer, complex tasks — smaller than the hype implies, and near zero for simple tasks. It does not add capacity; it mostly restores what fatigue takes.
Risks
Headache, anxiety, insomnia, appetite suppression are common. Rare but serious: severe skin reactions (Stevens-Johnson syndrome) — the reason it carries warnings. Interacts with hormonal contraceptives (reduces effectiveness). Long half-life (~12–15 h) wrecks sleep when taken late, which quietly cancels the benefit. Dependence risk is low but not zero.
Legal status
US: Schedule IV prescription drug — legal only with a prescription. Frequently purchased from overseas pharmacies, which is unlawful importation and quality-uncontrolled.
Evidence base
established literature
Large human evidence base: several phase 3 or 4 trial reports, plus multiple meta-analyses or systematic reviews.
- phase 3/4
- 13
- randomised
- 338
- reviews
- 154
- human trials
- 424
Counts are of published papers, not distinct trials, and measure how much research exists — not whether this works or is safe for you.
Research (12)
- Modafinil2006
- Modafinil, an atypical CNS stimulant?Adv Pharmacol · 2024
- Modafinil for poststroke patients: A systematic reviewInt J Clin Pract · 2019
- Modafinil2026
- Modafinil for the Improvement of Patient Outcomes Following Traumatic Brain InjuryInnov Clin Neurosci · 2018
- Amantadine and Modafinil as Neurostimulants During Post-stroke Care: A Systematic ReviewNeurocrit Care · 2020
- Modafinil Versus Amphetamine-Dextroamphetamine For Idiopathic Hypersomnia and Narcolepsy Type 2: A Randomized, Blinded, Non-inferiority TrialCNS Drugs · 2024
- Modafinil Treatment of Cocaine Dependence: A Systematic Review and Meta-AnalysisSubst Use Misuse · 2017
- Modafinil-associated psychosis: a systematic review of case characteristics and management strategiesTher Adv Psychopharmacol · 2026
- Modafinil: a review of neurochemical actions and effects on cognitionNeuropsychopharmacology · 2008
- A review on modafinil: the characteristics, function, and use in critical careJ Drug Assess · 2020
- Modafinil for cognitive neuroenhancement in healthy non-sleep-deprived subjects: A systematic reviewEur Neuropsychopharmacol · 2015
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