Amphetamine and dextroamphetamine facts, myths, and online claims
Amphetamine and dextroamphetamine (Adderall, Adderall XR, Mydayis) is a mix of amphetamine salts. It is a central nervous system stimulant used as part of a treatment program for attention deficit hyperactivity disorder (ADHD), and the immediate-release tablet is also approved for narcolepsy. The tablet is usually taken two or three times a day, four to six hours apart. The extended-release capsule is taken once in the morning and can be swallowed whole or sprinkled on applesauce. It is a Schedule II controlled substance.
Below: what the FDA label and NIH sources establish, what people say about Amphetamine and dextroamphetamine in public forums set next to the evidence, the misconceptions that come up most, and the questions people ask. Every line links to where it came from.
Established facts (8)
The Adderall tablet label approves it for ADHD in patients aged 3 and older and for narcolepsy in patients aged 6 and older. Adderall XR is approved for ADHD in adults and children aged 6 and older.
The label carries a boxed warning that Adderall has a high potential for abuse and misuse, which can lead to a substance use disorder, including addiction. It is a Schedule II controlled substance.
For the tablet, the first dose is given on awakening and one or two more doses at intervals of 4 to 6 hours. Late evening doses are avoided because of insomnia. Doses above 40 mg a day for ADHD are rarely needed.
Blood levels of the tablet peak about 3 hours after a dose. The half-life of dextroamphetamine is roughly 10 to 11 hours, and slightly longer for levoamphetamine, so the drug is not fully gone by the next morning.
In adult trials of Adderall XR, the most common side effects were dry mouth (35%), loss of appetite (33%), insomnia (27%), weight loss (10%), and anxiety (8%). In children, loss of appetite (22%) and insomnia (17%) were most common.
CNS stimulants raise blood pressure by a mean of about 2 to 4 mmHg and heart rate by about 3 to 6 beats per minute. Sudden death has been reported in patients with structural heart abnormalities or other serious heart disease.
CNS stimulants have been associated with weight loss and slower growth in children. The label says growth (height and weight) is monitored closely during treatment. Psychotic or manic symptoms occurred in about 0.1% of stimulant-treated patients in trials.
MedlinePlus lists nervousness, headache, dry mouth, constipation, and weight loss as common side effects, and states that the combination can be habit-forming.
What people say online (5)
Claims collected from public forums and review sites, quoted the way people put them. They are listed so the evidence can sit next to them, not because they are true. Status reflects what the cited studies and labels show as of 2026-09-07.
- Unproven
"Generic Adderall is weaker than brand, and some manufacturers (Teva, Alvogen, Lannett) changed the formula so it stopped working."
This is the single most common complaint in reviews, but it rests on personal reports. FDA-approved generics must contain the same active ingredient at the same strength and be bioequivalent to the brand. No published study shows a real potency difference between approved amphetamine salt generics.
Seen on Drugs.com reviews, WebMD reviewsEvidence FDA generic drug facts - Partly supported
"It stops working after a year or two and the dose has to keep going up."
Tolerance to stimulants is real but not universal. A 2022 review found one study where 24.7% of patients developed tolerance within days to weeks and another where 2.7% did over 10 years, with benefit lessening in many long-term patients. The label's efficacy trials lasted only 3 to 4 weeks.
- Partly supported
"Adderall makes you lose weight and kills your appetite."
Loss of appetite and weight loss are among the most common side effects in trials: appetite loss in 33% of adults and 22% of children on Adderall XR, and weight loss in 10% of adults. It is not approved for weight loss, and the effect is listed as an adverse reaction, not a benefit.
Seen on WebMD reviewsEvidence FDA label (DailyMed), MedlinePlus - Partly supported
"It gives you anxiety and panic attacks."
Anxiety was reported by 8% of adults in Adderall XR trials, and nervousness is a listed common side effect. Most people in trials did not report it, so it is a known but minority effect rather than something that happens to everyone.
Seen on WebMD reviewsEvidence FDA label (DailyMed), MedlinePlus - Unproven
"Adderall fixes depression and gives you motivation even if you do not have ADHD."
It is approved only for ADHD and narcolepsy. A meta-analysis of 48 studies in healthy adults found small effects on attention and memory, and suggested users may get more of an energy and motivation feeling than a thinking boost. NIDA notes no studies show it improves grades without ADHD.
Seen on Drugs.com reviewsEvidence Ilieva, Hook and Farah, J Cogn Neurosci 2015 (PubMed), NIDA
Common misconceptions (5)
Myth If it is prescribed and taken as directed, Adderall cannot be habit-forming.
Reality The label carries a boxed warning that Adderall has a high potential for abuse and misuse that can lead to a substance use disorder, including addiction. MedlinePlus says plainly that the combination can be habit-forming. Prescription status changes the legal picture, not the pharmacology.
Myth If Adderall calms you down or helps you focus, that proves you have ADHD.
Reality Stimulants improve attention and short-term memory a little in people without ADHD too. A meta-analysis of 48 studies in healthy adults found small but real effects on inhibitory control and memory. A good response to the drug is not a diagnostic test.
Myth Adderall makes anyone smarter and improves grades.
Reality NIDA states that for people without ADHD, there are no studies showing these medicines improve grades. In people with ADHD the drug helps with alertness and attention, which is different from raising intelligence.
Myth Adderall is a general pick-me-up for being tired.
Reality MedlinePlus states that dextroamphetamine and amphetamine should not be used to treat excessive tiredness that is not caused by narcolepsy. Its approved uses are ADHD and narcolepsy.
Myth You can stop Adderall abruptly with no after-effects because it is out of your system by the next day.
Reality The Adderall XR label says abrupt discontinuation after long use can produce dysphoric mood, depression, fatigue, vivid unpleasant dreams, and insomnia. Half-life is around 10 hours, so some drug is still present the next morning.
Questions people ask (8)
- How long does Adderall last?
- The immediate-release tablet is dosed at 4 to 6 hour intervals, which reflects how long each dose works. Blood levels peak at about 3 hours and the half-life is roughly 10 hours. Adderall XR is designed to be taken once in the morning and cover the day.
- Is Adderall addictive?
- It can be. The FDA label has a boxed warning that Adderall has a high potential for abuse and misuse, which can lead to a substance use disorder, including addiction. It is a Schedule II controlled substance, the most restricted class of prescription drugs.
- What is Adderall used for?
- It is used as part of a treatment program to control symptoms of ADHD, which usually also includes counseling and other support. The immediate-release form is also used for narcolepsy, a sleep disorder that causes sudden daytime sleep.
- Can Adderall XR be taken with food or opened?
- The capsule can be taken whole or opened and the entire contents sprinkled on applesauce, swallowed right away without chewing. It can be taken with or without food, but a high-fat meal delays the peak blood level by about 2.5 hours.
- Does vitamin C or orange juice cancel out Adderall?
- Not cancel, but acidifying agents such as vitamin C lower blood levels and reduce the effect of amphetamines, while alkalinizing agents increase blood levels. Urine acidity also affects how fast the body clears the drug. The effect is a reduction, not a complete block.
- What happens if Adderall is stopped suddenly?
- After a long period of use, abrupt stopping can cause withdrawal symptoms including dysphoric mood, depression, fatigue, vivid unpleasant dreams, and insomnia. MedlinePlus advises against stopping without discussing it with the prescriber.
- Does Adderall raise blood pressure?
- Yes, modestly on average. CNS stimulants raise blood pressure by a mean of about 2 to 4 mmHg and heart rate by about 3 to 6 beats per minute, and some people have larger increases. Sudden death has been reported in patients with serious structural heart disease.
- Does Adderall stunt growth in children?
- CNS stimulants have been associated with weight loss and a slower growth rate in children. The label calls for close monitoring of height and weight during treatment. MedlinePlus notes the child's doctor will watch growth carefully.
Not medical advice. This page summarizes public sources and public opinion about Amphetamine and dextroamphetamine. It cannot see your dose, your other medicines, or your history. A pharmacist or prescriber can.