Modafinil vs Adderall vs Vyvanse: A Label-by-Label Comparison

Written by Dr. Marcus Bennett · Medically reviewed by Dr. Elena Marquez, MD · Fact-checked October 2026 · How we review

People who search modafinil vs Adderall vs Vyvanse are usually trying to work out one thing: which of these three pills would suit them, and how they differ in real terms. Online answers tend to be personal stories. This page sticks to what's on paper, mainly the FDA-approved US prescribing labels for Provigil (modafinil), Adderall and Vyvanse, so you can have a better-informed conversation with a doctor.

A few ground rules. This is general information, not medical advice. We haven't tested any of these drugs. All three need a prescription in the United States, and none of them is approved to boost focus or grades in healthy people. We earn a commission if you buy through our Afinil links, at no extra cost to you.

The short answer

Adderall and Vyvanse are close relatives. Both are amphetamine-based central nervous system stimulants, both are Schedule II controlled substances with a boxed warning about abuse, misuse and addiction, and both are approved to treat ADHD. The biggest practical difference is delivery. Vyvanse is a prodrug, an inactive molecule the body slowly converts into dextroamphetamine, so it's taken once a day and tends to last into the evening. Adderall comes as immediate-release tablets and as extended-release capsules.

Modafinil is the odd one out. It's not an amphetamine and it isn't approved for ADHD at all. It's a wakefulness-promoting agent approved for excessive sleepiness from narcolepsy, obstructive sleep apnea and shift work disorder. It's Schedule IV, a lower-control category than the other two.

So the real question usually isn't which of the three is "best," but what problem you're trying to solve: an attention disorder, a sleep disorder or something else, like stress or poor sleep, that no pill fixes.

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The three drugs at a glance

How each one works

Modafinil

The Provigil label describes modafinil as a wakefulness-promoting agent whose exact mechanism isn't fully understood. It affects dopamine signaling, in part by binding to the dopamine transporter, but it doesn't release dopamine in the forceful way amphetamines do. It reaches peak levels in the blood about two to four hours after a dose, and its effective half-life after repeated dosing is around 15 hours. That long half-life is why it's taken in the morning for daytime sleepiness, and why a late dose can ruin a night's sleep.

Adderall

Adderall is a blend of four amphetamine salts that together give roughly three parts dextroamphetamine to one part levoamphetamine. Amphetamines increase the release of dopamine and norepinephrine and block their reuptake, which raises their levels in the brain. Immediate-release tablets act within about an hour and wear off within several hours, so people often take a second dose. Adderall XR uses beads that release in two stages to cover a longer day with one capsule.

Vyvanse

Vyvanse contains lisdexamfetamine, which is inactive as swallowed. After it's absorbed, enzymes, mainly in red blood cells, cut it into dextroamphetamine and the amino acid lysine. Because that conversion happens gradually, levels of active drug rise more slowly and more evenly than with immediate-release amphetamine. The label lists the time to peak dextroamphetamine levels at roughly three and a half hours, a bit longer when taken with food.

The prodrug design doesn't make Vyvanse free of risk. The FDA still classifies it as Schedule II and gives it the same boxed warning as other amphetamine products.

What each one is approved to treat

This is where the three diverge most.

• Modafinil treats excessive sleepiness from narcolepsy, obstructive sleep apnea (alongside standard treatments like CPAP, not instead of them) and shift work disorder. The label says safety and effectiveness in children haven't been established, and it isn't approved for any pediatric use.
• Adderall immediate-release tablets are approved for ADHD and narcolepsy. Adderall XR is approved for ADHD.
• Vyvanse is approved for ADHD in people six and older and for moderate to severe binge eating disorder in adults. Its label specifically says it isn't indicated or recommended for weight loss, and that its safety and effectiveness for treating obesity haven't been established.

Note what's missing from every list: studying, productivity, gaming, long drives or getting through a deadline. All of those are off-label uses, and for the two Schedule II drugs, using them without your own prescription is a federal crime.

Why modafinil isn't an ADHD drug

Modafinil comes up in ADHD conversations because some people find it helps them stay alert and focused. There's history here. In the mid-2000s, the maker of Provigil sought approval for a pediatric ADHD version called Sparlon. An FDA advisory committee voted against approval in 2006, mainly over serious skin reactions seen in children in clinical trials, including a possible case of Stevens-Johnson syndrome. The product was never approved.

Since then, the Provigil label has kept a clear warning that serious rash, including Stevens-Johnson syndrome, has been reported in adults and children, and that modafinil isn't approved for use in pediatric patients for any indication. Studies of modafinil in adults with ADHD have had mixed results, and it remains unapproved for ADHD in any age group. If a doctor does prescribe it off-label, that's a judgment made after an assessment, not something to try on your own.

Onset and how long each one lasts

These are general figures. Food, other medications, metabolism and dose all shift them, and how long a drug "feels" like it's working isn't the same as how long it stays in your body.

Doses on the labels

The numbers below are the labeled ranges, shown only so you can understand the comparison. Your prescriber sets your dose.

• Modafinil: 200 mg once a day for narcolepsy and sleep apnea, in the morning. For shift work disorder, 200 mg about an hour before the shift. The label notes doses up to 400 mg haven't shown consistent extra benefit.
• Adderall IR: For ADHD, doses are started low and raised in small steps. The label notes that only in rare cases will it be necessary to exceed 40 mg a day. For narcolepsy, the label range is 5 to 60 mg a day in divided doses.
• Vyvanse: For ADHD, the starting dose is 30 mg once a day in the morning, raised by 10 or 20 mg a week as needed, up to a maximum of 70 mg. For binge eating disorder, the recommended range is 50 to 70 mg a day.

Milligrams don't convert neatly between these drugs. A 30 mg Vyvanse capsule isn't equal to 30 mg of Adderall, and no dose of modafinil is equivalent to either. Switching between them is a medical decision.

Side effects compared

All three labels list side effects that showed up more often than with placebo in trials. These are some of the most common ones.

Serious warnings to know about

• Abuse and dependence. Adderall and Vyvanse carry a boxed warning for abuse, misuse and addiction, which the FDA updated for all prescription stimulants in 2023. Modafinil's label also discusses abuse potential, though it's in a lower schedule.
• Heart and blood pressure. Stimulant labels warn about increases in blood pressure and heart rate and about serious cardiovascular events in people with heart problems. The modafinil label also advises caution in people with certain heart conditions.
• Mental health. All three labels warn about psychiatric effects, such as new or worsening anxiety, mania or psychosis, especially in people with a history of these conditions.
• Skin reactions. Modafinil's label warns about rare but serious rashes, including Stevens-Johnson syndrome, and other hypersensitivity reactions. It advises stopping at the first sign of a rash unless it's clearly unrelated.
• Circulation and growth. Stimulant labels mention circulation problems in fingers and toes and slowed growth in children on long-term treatment.
• Birth control. The modafinil label notes it can make hormonal contraceptives less effective during use and for a month after stopping.

Each label has a longer list than this. Read the full medication guide with any prescription.

Prescriptions, refills and access

The schedule difference changes how easy each drug is to get and keep.

• Schedule II (Adderall, Vyvanse): No refills are allowed. A prescriber has to issue a new prescription, though federal rules let them write several dated prescriptions covering up to 90 days in one visit. Some states add their own limits.
• Schedule IV (modafinil): A prescription can include up to five refills within six months.

Stimulant supply has also been a recurring issue. The FDA listed a shortage of mixed amphetamine salts starting in October 2022, and later listed shortages of some other stimulant products. If you're on a stimulant, check the FDA drug shortages database or ask your pharmacist about current supply.

Cost

Prices depend heavily on insurance, pharmacy, dose and whether you get a brand or generic. Generic versions of all three are sold in the United States. Generic lisdexamfetamine became available in 2023, which brought prices down from brand-only Vyvanse for many people. Discount card prices and insurance copays vary too much to give a single figure.

For modafinil, some people look at overseas generics. As an example of current listed prices, Afinil showed ModaXL 200 mg, an Indian generic modafinil made by HOF Pharmaceuticals, at $3.99 a tablet for 10 tablets, $1.99 a tablet at 100, and $1.09 a tablet at 1,000 when we checked on October 29, 2026. Prices change, so check the live listing.

Be clear about the legal side. Modafinil is a Schedule IV prescription drug in the US. Importing it without a prescription isn't a legal route, US customs can seize parcels, and an overseas generic hasn't been reviewed by the FDA. Our guide on whether buying modafinil is legal covers this in more detail, and our page on getting a modafinil prescription online covers the legal route.

Which one fits which situation

This isn't a recommendation. It's a way to see why doctors reach for different drugs.

For a closer look at the sleep-disorder side, see modafinil for sleep disorders. If you're weighing modafinil against its close cousin, see Nuvigil vs Provigil.

Questions to bring to your doctor

• What's actually causing my symptoms, and have we ruled out sleep problems?
• Is my diagnosis one these drugs are approved for?
• How would my heart health, blood pressure or mental health history affect the choice?
• Do I need once-daily coverage, or would shorter doses fit my day better?
• What side effects should make me call you right away?
• How do refills, insurance coverage and shortages affect which one is practical?
• If I take birth control or other medicines, does that change anything?

The bottom line

Adderall and Vyvanse are two ways of delivering amphetamine, both approved for ADHD, both tightly controlled, and different mainly in how fast they kick in and how long they last. Modafinil is a different kind of drug for a different problem: excessive sleepiness from specific sleep disorders. It's in a lower schedule and is often described as smoother, but it isn't an ADHD treatment and it has its own serious, if rare, risks. If you're comparing the three because you're struggling to focus or stay awake, the most useful first step is a proper medical assessment, not a pill chosen from a comparison chart.

FAQ

Which is stronger, Adderall or Vyvanse?

They aren't directly comparable by milligram. Vyvanse is converted in the body to dextroamphetamine, one of the amphetamines in Adderall. Doctors dose each separately, and the right dose depends on the person, not a conversion chart.

Is modafinil like Vyvanse?

Not really. Vyvanse is an amphetamine-based stimulant approved for ADHD and binge eating disorder. Modafinil is a wakefulness-promoting agent approved for narcolepsy, obstructive sleep apnea and shift work disorder, and it isn't approved for ADHD.

Does Vyvanse last longer than Adderall?

Usually it lasts longer than immediate-release Adderall. The Vyvanse label describes an adult study that measured effects up to 14 hours after a dose. Adderall XR is also a once-daily extended-release form.

Is modafinil a controlled substance?

Yes. Modafinil is Schedule IV in the US. Adderall and Vyvanse are Schedule II, the strictest category for drugs with accepted medical use.

Can modafinil be used for ADHD?

It isn't FDA-approved for ADHD. The FDA declined to approve a pediatric ADHD version in 2006 after serious rash concerns, and the Provigil label says it isn't approved for children. Any off-label use is a decision for a doctor.

Can you get refills on Adderall or Vyvanse?

Schedule II drugs can't have refills. A prescriber can issue new prescriptions, and federal rules allow several dated prescriptions covering up to 90 days. Schedule IV drugs like modafinil can have up to five refills within six months.

Is Vyvanse approved for weight loss?

No. Vyvanse is approved for moderate to severe binge eating disorder in adults, and its label says it isn't indicated or recommended for weight loss.

Which is cheapest?

That depends on insurance and whether you get brand or generic. Generic lisdexamfetamine became available in 2023. Afinil listed ModaXL 200 mg, an Indian generic modafinil, at $3.99 a tablet for 10 or $1.99 a tablet at 100 when we checked on October 29, 2026, but buying it without a prescription isn't a legal route in the US.