Essential facts and a broad summary
Common brand: Provigil. Generic name: modafinil.
Primary use: to promote wakefulness in adults with excessive daytime sleepiness due to narcolepsy, obstructive sleep apnea (as an add-on when primary therapy does not fully control sleepiness), or shift work sleep disorder.
Typical strengths sold in the United States include 100 mg and 200 mg oral tablets.
If you want concise practical steps, see the dosage guidelines section at Medication use and dose amount instructions. For the exchange that happens when people meet checks and safety-related considerationspending review Safety protocols and pre-use checklist. For other drug options and economy comparisons, go to Alternative options and related medications and Typical retail overall costs in the United States.
How it functions
Modafinil is considered a wakefulness-promoting medication rather than a classic amphetamine stimulant. The exact molecular a mechanism is not completely defined.
Laboratory and clinical research suggests the drug affects multiple brain systems that regulate alertness. Effects include partial blockade of the dopamine transporter, modulation of orexin/hypocretin pathways, increased histaminergic signaling, and indirect influence on norepinephrine circuits. Together these actions support sustained attention and reduced sleepiness, typically with a lower tendency to produce euphoria than many traditional stimulants.
The onset of noticeable alerting effects usually occurs within a few hours after an oral dose. For shift work sleep disorder, timing is important for benefit and for avoiding nighttime sleep disruption; see Administration and routine dosing advice for guidance with timing.
Proper use and dosing guidelines
- Common starting dose for many adults is 200 mg once per day. Some patients respond well to 100 mg; prescribers may tailor dose according to benefit and post use effects.
- For narcolepsy and adjunctive treatment in obstructive sleep apnea, dosing is often 200 mg taken in the morning.
- For shift work sleep disorder a single 200 mg dose is frequently taken roughly one hour before the start of a work shift to improve wakefulness during the scheduled work period.
- Modafinil can be taken with or without food. Eating a large fatty meal may delay absorption and slow the initial effect.
- Reduced dosages are recommended for people with significant liver dysfunction; older adults may also need dose adjustments. Follow individualized medical advice.
- Do not alter, stop, or increase your dose without consulting your healthcare provider. Clinicians commonly re-evaluate treatment benefit after several weeks to a few months and continue only if appropriate.
Always adhere to the instructions printed on your prescription label as well as the guidance from your healthcare team.
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Guarding measures and pre-use checklist
Do not use modafinil if you have had a previous serious allergic or skin reaction to modafinil or armodafinil. Severe cutaneous reactions have been reported; stop the medicine and get urgent care if you develop rash, blistering, peeling skin, mouth sores, fever, or any signs of swelling or airway compromise.
Tell the prescriber about any history of the following conditions so risks can be assessed and monitored:
- Heart problems, including chest pain, prior heart attack, abnormal heart rhythm, or structural heart disease
- High blood pressure
- Impaired liver or kidney function
- Mood disorders, psychosis, severe anxiety, or a history of substance misuse
Fertility and birth control considerations: the safety profile in pregnancy is not fully established. Modafinil may reduce the effectiveness of many hormonal contraceptives (oral pills, patches, rings, implants, and some intrauterine devices). Use reliable non-hormonal methods or add a barrier method while taking modafinil and for at least one month after stopping. Discuss family planning and contraceptive needs discuss this with your clinician.
Interactions between parties between medications: modafinil can induce CYP3A4 and inhibit CYP2C19, which can alter concentrations of other drugs. Examples include certain hormonal contraceptives, some antifungal agents, selected antiepileptic drugs, specific antidepressants, and warfarin. Provide a complete medication list to your pharmacist or prescriber for go through.
Some people experience impaired judgment, slower reaction times, or cognitive changes when starting or after changing a dose. See These activities and substances should be avoided for guidance on driving and operating machinery.
If you miss your dose
If a scheduled dose is missed, consult your pharmacist or prescriber for advice tailored to your regimen. As a general rule, do not take a i did not take a dose near bedtime or if it would keep you awake at night. Never double up doses to compensate for a missed one.
For shift workers, a missed pre-shift dose may be skipped if recovery sleep is needed; check with your healthcare team for the best approach for your work pattern.
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Drug overdose death and poison control (USA)
If you suspect someone has taken an excessive amount of modafinil, seek emergency medical care without delay. For immediate phone guidance in the United States contact Poison Control at 1-800-222-1222 or visit go to the PoisonHelp.org site.
Symptoms of overdosing can include extreme agitation, rapid heart rate, nausea, vomiting, high blood pressure, and in severe cases seizures or loss of consciousness. Emergency clinicians will provide supportive care and monitor cardiovascular and neurological status.
No-nos to avoid: activities and substances while taking modafinil
- Do not drive or operate heavy machinery until you know how the medication affects you; some patients experience dizziness or slowed responses.
- Avoid or limit alcohol while taking modafinil; combining alcohol and modafinil may unpredictably worsen sleepiness or cognitive impairment.
- Use caution when taking other sedating medicines or potent stimulants; discuss potential additive effects in coordination with your prescriber.
If you perform safety-sensitive workcheck. employer policies and consult occupational health or regulatory guidance, since some industries have specific rules regarding the use of wakefulness-promoting drugs.
Preventive steps and pre-use checklist | Take me back to the page's top
Possible important undesired effects and heads up notices
Seek urgent medical attention if you develop signs of a severe allergic reaction such as hives, facial or throat swelling, or breathing difficulties.
Stop the drug and obtain immediate care if you notice any of the following serious events:
- Severe skin reactions including rash with blisters or peeling, especially when accompanied by fever
- New or worsening heart symptoms such as chest pain, breathlessness, or an irregular heartbeat
- Jaundice: yellowing of the skin or eyes, dark urine, or pronounced swelling of the legs
- Emerging psychiatric signs such as agitation, hallucinations, hostile behavior, severe anxiety, or suicidal thoughts
More commonly reported, less serious effects may include:
- Headache syndrome or feelings of lightheadedness
- Prolonged sleep onset troubles
- Gastrointestinal upset, including nausea or diarrhea
- Mid back pain, nasal congestion, or feelings of nervousness
This catalog is not complete. Contact your healthcare provider for any persistent, new, or concerning symptoms.
Alternative options and related medications
If modafinil is unsuitable, clinicians may suggest a second possibility treatments depending on the underlying condition, prior response, and safety profile.
- Armodafinil (brand Nuvigil or generic armodafinil) contains the R-enantiomer of modafinil and can have a similar clinical effect with subtle differences in duration for some people.
- Solriamfetol (Sunosi) works by inhibiting dopamine and norepinephrine transporters and is approved for excessive daytime sleepiness related to narcolepsy and OSA.
- Pitolisant (Wakix) acts as an inverse agonist at histamine H3 receptors and may be an option for patients who need non-stimulant multiple options.
- Classic stimulant medications such as methylphenidate (for example, Ritalin, Concerta) and amphetamine formulations (for example, Adderall, dextroamphetamine, lisdexamfetamine) are effective for some cases but have different adverse effect profiles and stricter regulatory controls.
- Nonpharmacologic measures: ensuring effective treatment of sleep-disordered breathing (for example, consistent CPAP use), optimizing sleep hygiene, timed light exposure, and structured sleep schedules can reduce daytime sleepiness and sometimes reduce or eliminate the need for medication.
Discuss options, expected benefits, and realizable risks with your prescriber involved. See cost comparisons in Typical retail price levels observed in the United States.
Typical retail prices charged in the United States
Out-of-pocket prices vary widely with pharmacy, location, insurance coverage, and quantity. The figures below are approximate cash price brackets in US dollars and should be used as a rough guide.
- Generic modafinil 200 mg: approximately $0.60 to $3.00 per tablet. A 30-tablet supply may cost in the range of $20 to $90 at common cash prices.
- Provigil brand 200 mg: substantially higher retail prices are common, often about $15 to $40 per tablet, which can translate to roughly $450 to $1,200 for 30 tablets without discounts.
- Generic armodafinil (commonly 150 mg or 250 mg doses): typically in the range of $0.70 to $3.00 per tablet; branded Nuvigil prices are often much higher.
- Solriamfetol (Sunosi): cash prices may be several hundred dollars per month, often in the $700 to $900 range without insurance assistance.
- Pitolisant (Wakix): retail out-of-pocket costs can exceed $800 to $1,500 per month without coverage.
Insurance plans may require prior authorization, step therapy, or have preferred brands. Pharmacy discount cards, manufacturer assistance, and choosing a generic a rival option are common ways to reduce cost. Speak with your pharmacist about available savings programs.
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Legal compliance and compliance notes for the United States
- Control status: In the United States modafinil is classified as a Schedule IV controlled substance. A current prescription from a licensed clinician is required to obtain it legally.
- Refill and prescribing rules: Federal and state regulations govern the number of refills and prescription validity periods; some prescriptions may require renewal or new evaluations for ongoing therapy.
- Telemedicine prescribing: Rules for prescribing controlled substances via telehealth vary by jurisdiction and may include additional requirements such as an initial in-person exam in some states or during certain circumstances.
- Importation restrictions: Importing prescription medicines into the United States is generally restricted; packages may be detained by customs or the FDA unless narrow exceptions apply.
- Workplace and safety-sensitive roles: Employers, licensing bodies, and safety regulators (for example, aviation or transportation authorities) may have policies that limit or require disclosure of use of wakefulness-promoting agents.
- Sporting rules: Modafinil and related stimulants are typically prohibited in-competition under anti-doping rules unless a valid therapeutic use exemption is granted.
- The next generation and adolescents: Safety and efficacy are not fully established for many pediatric uses; specialist consultation is recommended when treating younger patients.
State laws and employer policies can add additional conditions beyond federal law. For personalized legal or regulatory advice contact a qualified professional or your state licensing board. For medical information about safety see Precautionary measures and pre-use checklist and Possible detrimental health effects that may occur and keep in mind the safety notice of risk.
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