Modafinil and armodafinil
In narcolepsy, sleep apnea and shift work disorder, modafinil and armodafinil kept people awake a few minutes longer on lab tests and lowered sleepiness scores against placebo. In rested healthy adults, pooled trials found a very small gain on cognitive tests, an effect size near 0.1. Headache, nausea and insomnia were more frequent, and serious rash is rare.
- Status
- Prescription drugs in the US and Schedule IV controlled substances. Modafinil and armodafinil are FDA-approved to improve wakefulness in adults with excessive sleepiness from narcolepsy, obstructive sleep apnea or shift work disorder. In sleep apnea the label states they treat the sleepiness, not the blocked airway. Neither is approved for focus or alertness in people without a sleep disorder. Neither label carries a boxed warning.
- Also called
- modafinil, Provigil, armodafinil, Nuvigil, R-modafinil, eugeroic, wakefulness-promoting agent, smart drug
- Taken for
- narcolepsy sleepiness, ADHD, shift work sleepiness, sleep apnea sleepiness despite CPAP, focus, concentration, alertness, studying, working through sleep loss, fatigue, depression add-on, nootropic
Strong several reviews agree · Moderate one review or consistent trials · Limited one or a few small studies · Untested no study in people, listed with what it rests on
Shown to help6
- StrongShown to reduce daytime sleepiness in adults with narcolepsy, about 3 points on the Epworth scale and 3 minutes longer awake on a lab test, but not cataplexy.Very common
- StrongShown to reduce residual sleepiness in sleep apnea, about 2 to 3 points on the Epworth scale, with about three times the adverse events of placebo.Very common
- StrongShown to improve cognitive test scores in rested healthy adults by a very small amount, an effect size near 0.1, with no clear advantage in any one domain.
- ModerateShown to reduce sleepiness on night shifts in people diagnosed with shift work disorder, about 1 point on a 10-point scale. No trials tested shift workers without the disorder.Very common
- ModerateShown to keep sleep-deprived healthy people awake and to hold memory and executive function better than placebo, though repeated doses did not prevent decline over longer deprivation.
- ModerateShown to improve depression scores and remission modestly when added to standard treatment, in unipolar and bipolar depression, an off-label use.
Reported risks11
- ModerateShown to raise headache in placebo-controlled trials, 34% on modafinil against 23% on placebo, and more at higher doses.Very common
- ModerateShown to raise nausea, 11% on modafinil against 3% on placebo, along with smaller rises in appetite loss, dry mouth and diarrhea. 8% stopped for side effects.Very common
- LimitedMixed results: a pregnancy registry found major birth defects in 13% of exposed live births against a 3% population rate, while a French national cohort found no clear rise.Very common
- ModerateShown to raise insomnia and anxiety, each 5% on modafinil against 1% on placebo, and nervousness 7% against 3%. Anxiety rose with dose.Common
- ModerateShown to raise reports of high blood pressure, 3% against 1% on placebo, and fast heart rate and palpitations, 2% against 1%.Common
- ModerateShown to raise mean GGT and alkaline phosphatase in placebo-controlled trials, mostly within the normal range. ALT and AST did not differ.Common
- LimitedThe label warns of serious rash, including Stevens-Johnson syndrome. In children's trials 0.8% stopped for rash, against none on placebo. Modafinil is not approved for children.Uncommon
- LimitedCase reports: the label describes mania, delusions, hallucinations, suicidal thoughts and aggression after approval, many in people with prior psychiatric history.How often is not known
- LimitedThe label states modafinil produces euphoric effects like other stimulants in experienced drug users, and found no withdrawal symptoms over 14 days after 9 weeks of use.How often is not known
- LimitedThe label warns that modafinil and armodafinil may reduce how well hormonal birth control prevents pregnancy, during use and for a month after stopping.How often is not known
- LimitedThe label states modafinil can lower cyclosporine levels and raise levels of drugs cleared by CYP2C19, such as diazepam, propranolol, phenytoin and omeprazole.How often is not known
What people take it for, and what was found
Shown to help6
Daytime sleepiness in narcolepsy
Shown to reduce daytime sleepiness in adults with narcolepsy, about 3 points on the Epworth scale and 3 minutes longer awake on a lab test, but not cataplexy.
Compared with placebo [1][2][3]; sodium oxybate in one comparison [1]
The numbers and sources
- How common
- Very common: more than 1 in 10 people.
- Effect
- Against placebo, modafinil lowered Epworth Sleepiness Scale scores by 2.73 points (95% CI 2.08 to 3.39) and lengthened time to fall asleep on the Maintenance of Wakefulness Test by 2.82 minutes (95% CI 2.40 to 3.24). It did not change the number of cataplexy attacks a day. Its effect on sleepiness was similar to sodium oxybate's [1]. An updated meta-analysis found 3.56 more minutes on the Maintenance of Wakefulness Test (95% CI 2.25 to 4.86) and a 3.34-point drop on the Epworth scale (95% CI 2.56 to 4.13) [2]. In the two label trials, 58% to 72% on modafinil were rated improved against 37% to 38% on placebo [3].
- Population
- 1,054 patients in 9 randomized trials [1]; 997 adults in 5 trials pooled, out of 9 studies reviewed [2]; 558 adults in two 9-week US trials [3].
- Sources
- [1], [2], [3]
- Caveats
- The 2026 review notes the randomized trials date mostly from the 1990s and early 2000s, with no new eligible trials in the past decade, and that long-term efficacy is not established [2]. Patients on modafinil still averaged well below normal wakefulness on the lab test [3].
Sleepiness in sleep apnea despite CPAP
Shown to reduce residual sleepiness in sleep apnea, about 2 to 3 points on the Epworth scale, with about three times the adverse events of placebo.
Compared with placebo, on top of CPAP [3][4][5]
The numbers and sources
- How common
- Very common: more than 1 in 10 people.
- Effect
- Modafinil or armodafinil improved Epworth Sleepiness Scale scores by 2.2 points (95% CI 1.5 to 2.9) and Maintenance of Wakefulness Test times by 3 minutes (95% CI 2.1 to 3.8) over placebo. Adverse events tripled and withdrawals for adverse events doubled, with no rise in hospitalizations or deaths [4]. A second meta-analysis found Epworth scores lower by 2.96 points with modafinil (95% CI 2.19 to 3.73) and 2.63 with armodafinil (95% CI 1.85 to 3.40) [5]. In the 12-week label trial, 61% on modafinil 200 mg and 68% on 400 mg were rated improved against 37% on placebo [3].
- Population
- 1,466 patients in 10 trials of at least 2 weeks [4]; 723 patients in 11 modafinil trials and 1,009 in 5 armodafinil trials [5]; 327 adults with sleep apnea, 80% fully using CPAP [3].
- Sources
- [3], [4], [5]
- Caveats
- The European Medicines Agency removed this indication in 2011 over an unfavorable balance of benefit and risk, which the first review sought to re-examine [4]. The drug treats sleepiness, not the airway obstruction [3].
Sleepiness in shift work disorder
Shown to reduce sleepiness on night shifts in people diagnosed with shift work disorder, about 1 point on a 10-point scale. No trials tested shift workers without the disorder.
Compared with placebo [6][7][8]
The numbers and sources
- How common
- Very common: more than 1 in 10 people.
- Effect
- Armodafinil taken before the night shift lowered Karolinska Sleepiness Scale scores by 0.99 points (95% CI 0.67 to 1.32, range 1 to 10) and sped simple reaction time by 50 milliseconds at 3 months. Modafinil lowered the same score by 0.90 points (95% CI 0.35 to 1.45) [7]. In the pivotal 3-month trial, modafinil 200 mg lengthened nighttime time to fall asleep by 1.7 minutes against 0.3 on placebo, and 74% against 36% were rated clinically improved [8]. The armodafinil label reports the same kind of trial results for 150 mg [6].
- Population
- 2 armodafinil trials with 572 participants and 1 modafinil trial with 183, within a Cochrane review of 15 trials and 718 shift workers [7]; 209 patients with shift work disorder [8].
- Sources
- [6], [7], [8]
- Caveats
- The trial authors noted that treated patients remained very sleepy at night [8]. The Cochrane review found no trials in shift workers without a diagnosed disorder, and rated the evidence moderate quality [7].
Focus and memory in rested healthy adults
Shown to improve cognitive test scores in rested healthy adults by a very small amount, an effect size near 0.1, with no clear advantage in any one domain.
Compared with placebo [9][10][11]
The numbers and sources
- Effect
- Across 19 placebo-controlled trials of a single dose, modafinil improved cognitive performance over placebo by g = 0.10 (95% CI 0.05 to 0.15). Domains did not differ, and 200 mg did no better than 100 mg [9]. A second meta-analysis found an overall effect of SMD 0.12, driven by memory updating (SMD 0.28), and its authors wrote that the belief among users that these drugs are strong cognitive enhancers is not supported [10]. A systematic review found most basic tests showed better executive function, half showed better attention and memory, and a few showed worse divergent creative thinking. It found no excess of side effects or mood changes [11].
- Population
- 19 trials and 67 effect sizes in adults who were not sleep deprived [9]; 14 modafinil studies with 64 effect sizes in healthy adults who were not sleep deprived [10]; primary studies in healthy adults from 1990 to 2014 [11].
- Sources
- [9], [10], [11]
- Caveats
- Most trials tested one dose in a lab, not repeated use as people take it [10]. An effect size of 0.1 is about a tenth of a standard deviation on a test score. [9] included some psychiatric samples and found no difference from nonpsychiatric ones.
Alertness and performance during sleep deprivation
Shown to keep sleep-deprived healthy people awake and to hold memory and executive function better than placebo, though repeated doses did not prevent decline over longer deprivation.
Compared with placebo [12]
The numbers and sources
- Effect
- In sleep-deprived individuals, modafinil maintained wakefulness, memory and executive function to a significantly greater degree than placebo. Over longer sleep deprivation, repeated doses did not prevent cognitive performance from deteriorating, while wakefulness was maintained and people possibly became overconfident about their own performance [12].
- Population
- Healthy adults in single- or double-blind randomized trials [12].
- Sources
- [12]
- Caveats
- One meta-analysis, and the abstract does not give pooled effect sizes or head counts [12].
Depression, as an add-on
Shown to improve depression scores and remission modestly when added to standard treatment, in unipolar and bipolar depression, an off-label use.
Compared with placebo added to standard treatment [15][16]
The numbers and sources
- Effect
- Added to first-line treatment, modafinil improved overall depression scores (point estimate -0.35, 95% CI -0.61 to -0.10) and remission (OR 1.61, 95% CI 1.04 to 2.49), with a positive effect on fatigue and adverse events no different from placebo [15]. In bipolar depression, added modafinil or armodafinil raised response (RR 1.18, 95% CI 1.01 to 1.37) and remission (RR 1.38, 95% CI 1.10 to 1.73), with no rise in mood switching or suicide attempts [16].
- Population
- 910 adults with major depressive disorder or bipolar depression in 6 trials [15]; 795 on drug and 792 on placebo in 5 bipolar depression trials, 4 of them of armodafinil [16].
- Sources
- [15], [16]
- Caveats
- Few trials. Both reviews included bipolar trials, so they overlap. Not an FDA-approved use.
Mixed results2
Fatigue in neurological conditions
Mixed results: one review found less fatigue in multiple sclerosis, and an earlier review found benefit only after brain injury and not in multiple sclerosis or Parkinson's.
Compared with placebo [13][14]
The numbers and sources
- Effect
- Across 10 trials, modafinil lowered fatigue after traumatic brain injury (MD -0.82, 95% CI -1.54 to -0.11) and sleepiness in Parkinson's disease (MD -2.45 on the Epworth scale), but fatigue did not differ from placebo in pooled Parkinson's or multiple sclerosis studies [13]. A later review of 7 studies in multiple sclerosis found lower Modified Fatigue Impact Scale scores (MD -4.42, 95% CI -8.01 to -0.84) and more adverse events (RR 1.30) [14].
- Population
- 535 patients with Parkinson's disease, multiple sclerosis, brain injury or post-polio syndrome in 10 trials [13]; 7 controlled studies in multiple sclerosis [14].
- Sources
- [13], [14]
- Caveats
- Most trials were small [13]. The two reviews disagree on multiple sclerosis, and neither studied fatigue in people without a diagnosed condition.
ADHD
Mixed results: in a network meta-analysis, modafinil reduced ADHD symptoms in children on clinician and teacher ratings but did not differ from placebo in adults.
Compared with placebo, and other ADHD drugs in a network analysis [17]
The numbers and sources
- Effect
- In children and adolescents, every drug in the analysis, modafinil included, beat placebo on clinician ratings, and modafinil was one of two drugs that beat placebo on teacher ratings (SMD -0.76, 95% CI -1.15 to -0.37). In adults, modafinil did not differ from placebo (SMD 0.16, 95% CI -0.28 to 0.59) and was less well tolerated than placebo (OR 4.01). Amphetamines outperformed modafinil head to head [17].
- Population
- 133 double-blind trials in children, adolescents and adults with ADHD [17].
- Sources
- [17]
- Caveats
- Most comparisons were indirect and rated low or very low confidence [17]. Modafinil is not FDA-approved for ADHD.
Doses studied
The modafinil label gives 200 mg once in the morning for narcolepsy and sleep apnea, and 200 mg about one hour before the shift for shift work disorder. The label states 400 mg a day was tolerated but gave no consistent extra benefit over 200 mg [3]. The armodafinil label gives 150 to 250 mg in the morning for sleep apnea and narcolepsy, and 150 mg before the shift for shift work disorder [6]. The pooled trials in rested healthy adults gave single doses, mostly 100 or 200 mg, and found no difference between them [9]. The shift work trial gave 200 mg before each shift for 3 months [8].
Risks
Reported risks10
Headache
Shown to raise headache in placebo-controlled trials, 34% on modafinil against 23% on placebo, and more at higher doses.
The numbers and sources
- How common
- Very common: more than 1 in 10 people.
- Effect
- In pooled placebo-controlled trials, headache occurred in 34% on modafinil against 23% on placebo, and was dose related across 200, 300 and 400 mg. Headache was the most frequent reason for stopping (2%) [3]. On armodafinil, headache occurred in 17% against 9% [6].
- Population
- 934 adults on modafinil and 567 on placebo in narcolepsy, sleep apnea and shift work trials [3]; 645 on armodafinil and 445 on placebo [6].
- Sources
- [3], [6]
- Caveats
- Trials ran 4 to 12 weeks in people with sleep disorders.
Nausea and other common side effects
Shown to raise nausea, 11% on modafinil against 3% on placebo, along with smaller rises in appetite loss, dry mouth and diarrhea. 8% stopped for side effects.
The numbers and sources
- How common
- Very common: more than 1 in 10 people.
- Effect
- In pooled trials, nausea occurred in 11% vs 3% on placebo, anorexia in 4% vs 1%, dry mouth in 4% vs 2%, diarrhea in 6% vs 5% and dizziness in 5% vs 4%. 8% stopped modafinil for an adverse reaction against 3% on placebo [3]. On armodafinil, nausea occurred in 7% vs 3% and dizziness in 5% vs 2%, and 7% stopped against 4% [6].
- Population
- 934 on modafinil and 567 on placebo [3]; 645 on armodafinil and 445 on placebo [6].
- Sources
- [3], [6]
- Caveats
- Short trials in people with sleep disorders.
Insomnia, nervousness and anxiety
Shown to raise insomnia and anxiety, each 5% on modafinil against 1% on placebo, and nervousness 7% against 3%. Anxiety rose with dose.
The numbers and sources
- How common
- Common: between 1 in 100 and 1 in 10 people.
- Effect
- In pooled trials, insomnia occurred in 5% vs 1% on placebo, anxiety in 5% vs 1% and nervousness in 7% vs 3%. Anxiety was dose related [3]. On armodafinil, insomnia occurred in 5% vs 1% [6]. A meta-analysis of neurological conditions found insomnia and nausea more frequent on modafinil than placebo [13].
- Population
- 934 on modafinil and 567 on placebo [3]; 645 on armodafinil and 445 on placebo [6]; 535 patients in 10 trials [13].
- Sources
- [3], [6], [13]
- Caveats
- Doses in the label trials were taken in the morning or before a shift.
Blood pressure and heart rate
Shown to raise reports of high blood pressure, 3% against 1% on placebo, and fast heart rate and palpitations, 2% against 1%.
The numbers and sources
- How common
- Common: between 1 in 100 and 1 in 10 people.
- Effect
- In pooled trials, hypertension was reported in 3% on modafinil vs 1% on placebo, chest pain in 3% vs 1%, palpitations in 2% vs 1% and tachycardia in 2% vs 1%. The label reports chest pain, palpitations and ischemic ECG changes in three people with mitral valve prolapse or left ventricular hypertrophy, and one episode of asystole in a patient with prior fainting [3]. The Cochrane review of shift workers lists a rise in blood pressure among reported adverse effects [7].
- Population
- 934 on modafinil and 567 on placebo [3]; shift workers in trials [7].
- Sources
- [3], [7]
- Caveats
- Short trials. The rates are reports of adverse reactions, not measured mean blood pressure change.
Liver enzyme changes
Shown to raise mean GGT and alkaline phosphatase in placebo-controlled trials, mostly within the normal range. ALT and AST did not differ.
The numbers and sources
- How common
- Common: between 1 in 100 and 1 in 10 people.
- Effect
- Mean GGT and alkaline phosphatase were higher after modafinil but not placebo, and rose over time, with few values outside the normal range. ALT, AST, albumin and total bilirubin did not differ. "Abnormal liver function" was reported as an adverse reaction in 2% vs 1% on placebo [3].
- Population
- Adults in placebo-controlled label trials [3].
- Sources
- [3]
- Caveats
- The label gives no size for the mean change. The band above is the adverse-reaction rate.
Serious rash, including Stevens-Johnson syndrome
The label warns of serious rash, including Stevens-Johnson syndrome. In children's trials 0.8% stopped for rash, against none on placebo. Modafinil is not approved for children.
The numbers and sources
- How common
- Uncommon: between 1 in 1,000 and 1 in 100 people.
- Effect
- In modafinil trials in patients under 17, rash leading to discontinuation occurred in about 0.8% (13 of 1,585), including 1 possible case of Stevens-Johnson syndrome and 1 multi-organ hypersensitivity reaction, against none of 380 on placebo. Median time to rash was 13 days. The label states the postmarketing reporting rate of toxic epidermal necrolysis and Stevens-Johnson syndrome exceeds the background rate of 1 to 2 cases per million person-years, and reports multi-organ hypersensitivity with at least one death [3]. Angioedema and allergic reactions were seen in armodafinil trials [3].
- Population
- 1,585 pediatric patients in trials, and postmarketing reports in adults and children [3].
- Sources
- [3]
- Caveats
- The trial rate comes from children. The adult rate is not known, since postmarketing reports have no denominator.
Psychiatric symptoms
Case reports: the label describes mania, delusions, hallucinations, suicidal thoughts and aggression after approval, many in people with prior psychiatric history.
The numbers and sources
- How common
- How often is not known: the sources give no rate.
- Effect
- Postmarketing reports include mania, delusions, hallucinations, suicidal ideation and aggression, some leading to hospitalization. A healthy male volunteer developed paranoid delusions and hallucinations on 600 mg a day, three times the usual dose, with sleep deprivation, which cleared 36 hours after stopping [3]. In the bipolar depression trials, mood switching did not differ from placebo (RR 0.99) [16].
- Population
- Postmarketing reports [3]; 1,587 patients in 5 bipolar trials [16].
- Sources
- [3], [16]
- Caveats
- Reports have no denominator and cannot prove cause.
Abuse and dependence
The label states modafinil produces euphoric effects like other stimulants in experienced drug users, and found no withdrawal symptoms over 14 days after 9 weeks of use.
The numbers and sources
- How common
- How often is not known: the sources give no rate.
- Effect
- Both drugs are Schedule IV. In an inpatient study of people experienced with drugs of abuse, modafinil 200 to 800 mg produced psychoactive and euphoric effects consistent with methylphenidate. Monkeys trained on cocaine self-administered it. After 9 weeks of use in one placebo-controlled trial, no withdrawal symptoms were reported over 14 days, though sleepiness returned in people with narcolepsy [3].
- Population
- People with a history of drug use in an inpatient study, and patients in one 9-week trial [3].
- Sources
- [3]
- Caveats
- The label gives no rate of misuse in the general population.
Hormonal birth control
The label warns that modafinil and armodafinil may reduce how well hormonal birth control prevents pregnancy, during use and for a month after stopping.
The numbers and sources
- How common
- How often is not known: the sources give no rate.
- Effect
- Modafinil induces the liver enzyme CYP3A4/5, which may lower blood levels of steroidal contraceptives such as ethinyl estradiol. The labels state their effectiveness may be reduced while taking the drug and for one month after stopping, including depot and implanted forms [3][6]. Armodafinil 250 mg lowered exposure to midazolam, another drug cleared by this enzyme, by 32% [6].
- Population
- Labeling statement based on drug interaction studies [3][6].
- Sources
- [3], [6]
- Caveats
- The labels give no rate of unplanned pregnancy.
Other drug interactions
The label states modafinil can lower cyclosporine levels and raise levels of drugs cleared by CYP2C19, such as diazepam, propranolol, phenytoin and omeprazole.
The numbers and sources
- How common
- How often is not known: the sources give no rate.
- Effect
- By inducing CYP3A4/5, modafinil may lower levels of cyclosporine, midazolam and triazolam. By inhibiting CYP2C19, it may raise levels of phenytoin, diazepam, propranolol, omeprazole and clomipramine, and, in people lacking CYP2D6, tricyclic antidepressants and SSRIs. The label advises more frequent INR checks with warfarin and caution with MAO inhibitors [3].
- Population
- Labeling statement based on drug interaction studies [3].
- Sources
- [3]
- Caveats
- The label describes changes in drug levels and gives no rate of harm.
Mixed results1
Pregnancy
Mixed results: a pregnancy registry found major birth defects in 13% of exposed live births against a 3% population rate, while a French national cohort found no clear rise.
The numbers and sources
- How common
- Very common: more than 1 in 10 people.
- Effect
- In the 14-year manufacturer pregnancy registry, major congenital malformations occurred in 13.1% of prospectively enrolled live births (18 of 137, 95% CI 8.0 to 20.0) against a population rate of 3%. Spontaneous abortion occurred in 10.9% [18]. In French national data, first-trimester modafinil exposure was linked to more major anomalies than methylphenidate (aRR 1.77, 95% CI 1.01 to 3.07), but not clearly more than matched unexposed children (aRR 1.23, 95% CI 0.76 to 1.99), with no rise in neurodevelopmental disorders [19]. The labels report fetal growth restriction and miscarriage cases and developmental toxicity in rats and rabbits [3][6].
- Population
- 191 pregnancies, 137 prospective live births [18]; 865 children exposed to modafinil among 10,955,766 births [19].
- Sources
- [18], [19], [3], [6]
- Caveats
- The registry compared with an outside population rate, not a matched group, and was small [18]. The cohort's intervals were wide [19]. The band above is the registry rate. Two 2020 Scandinavian studies were not readable from an open source and are left out.
Claims tested and not found
- That modafinil is a strong cognitive enhancer for rested healthy people. Two meta-analyses found overall effects of g = 0.10 and SMD 0.12, with no difference between domains in one and gains limited to memory updating in the other [9][10].
- That a higher dose sharpens thinking more. In pooled single-dose trials in rested adults, 200 mg did not differ from 100 mg [9]. In narcolepsy and sleep apnea, 400 mg gave no consistent extra benefit over 200 mg [3].
- That repeated doses protect performance through long sleep deprivation. Repeated doses kept people awake but did not prevent cognitive performance from declining [12].
- That modafinil reduces cataplexy in narcolepsy. Cataplexy attacks did not differ from placebo [1].
Related
Sources
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- U.S. Food and Drug Administration. PROVIGIL (modafinil) tablets, prescribing information. 2025. DailyMed. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=e16c26ad-7bc2-d155-3a5d-da83ad6492c8
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