Amphetamine/dextroamphetamine is a prescription stimulant used to treat two conditions: attention deficit hyperactivity disorder (ADHD) and narcolepsy. Sold under the brand name Adderall and available as a generic, it comes in both immediate-release tablets and extended-release capsules. It is one of the most widely prescribed medications for ADHD in children, adolescents, and adults.
ADHD: The Primary Use
The vast majority of amphetamine/dextroamphetamine prescriptions are written for ADHD. The medication reduces the core symptoms of the condition: difficulty sustaining attention, impulsive behavior, and excessive physical restlessness. It’s approved for children as young as 3 years old (immediate-release) and 6 years old (extended-release), as well as for adults of any age.
Clinical evidence shows the drug is effective at reducing ADHD symptom severity. In a review of 13 studies involving over 2,000 adult participants, amphetamines as a group produced a large, statistically significant reduction in clinician-rated ADHD symptoms. Patients themselves also reported meaningful improvement. Notably, whether someone took a low or high dose, used an immediate-release or sustained-release formulation, or had a co-occurring condition like depression didn’t meaningfully change the drug’s effect on core ADHD symptoms.
What the medication does not do is improve general mood or reduce anxiety. Studies have consistently found that amphetamines don’t significantly reduce symptoms of depression or anxiety, and they don’t improve overall global functioning as measured by standard clinical scales. The benefit is specific to attention, focus, and impulse control.
How It Works in the Brain
Amphetamine/dextroamphetamine increases the levels of two chemical messengers in the brain: dopamine and norepinephrine. Dopamine plays a central role in motivation, reward, and the ability to sustain focus. Norepinephrine helps with alertness and attention.
The drug works differently from most medications. Rather than simply blocking the recycling of these chemical messengers back into nerve cells, it actually enters the recycling system as a decoy. It competes with dopamine and norepinephrine for the transporters that normally pull them out of the gaps between nerve cells. Once inside, it also triggers a reverse flow, pushing stored dopamine and norepinephrine out into those gaps. The result is a significant increase in both chemicals in the parts of the brain that regulate attention and wakefulness.
Narcolepsy: The Other Approved Use
Narcolepsy is a sleep disorder that causes overwhelming daytime drowsiness and sudden, uncontrollable episodes of falling asleep. Amphetamine/dextroamphetamine promotes wakefulness and helps people with narcolepsy stay alert during the day. It is approved for narcolepsy in patients 6 years and older, though the condition rarely appears in children under 12.
The medication should not be used for ordinary tiredness or sleepiness that isn’t caused by narcolepsy. It is not a general-purpose energy booster, and using it that way carries real risks of dependence.
Off-Label Uses
Doctors sometimes prescribe amphetamine/dextroamphetamine for conditions beyond ADHD and narcolepsy. These are considered “off-label” uses, meaning the FDA hasn’t formally approved the drug for them, but clinical experience or limited evidence supports trying them in certain patients.
The best-supported off-label uses include treatment-resistant depression (particularly in older adults, where it may be added to an existing antidepressant) and cognitive or motivational problems following traumatic brain injury. Clinicians also occasionally use it for fatigue related to neurological conditions like multiple sclerosis, or for excessive daytime sleepiness when other wakefulness-promoting medications haven’t worked.
Some uses are more controversial and generally not recommended. Using amphetamines for weight loss, cognitive performance enhancement in healthy people, or apathy in dementia has very limited evidence and raises significant safety concerns.
Common Side Effects
The most frequent side effects are loss of appetite, difficulty falling asleep, dry mouth, increased heart rate, and feelings of nervousness or restlessness. Many of these are most noticeable when starting the medication or increasing the dose and tend to lessen over time. Weight loss and reduced appetite are particularly common in children, which is why pediatricians typically monitor growth during treatment.
Some people experience headaches, stomach discomfort, or mood changes like irritability. At higher doses, side effects tend to be more pronounced, but the therapeutic benefit for ADHD symptoms doesn’t necessarily require high doses to be effective.
Serious Risks and Warnings
Amphetamine/dextroamphetamine carries an FDA black box warning for abuse, misuse, and addiction. This is the most serious type of safety warning the FDA issues. The drug has a high potential for misuse, and taking it in higher doses or through non-oral methods (such as crushing and snorting) significantly increases the risk of overdose and death.
The medication also poses cardiovascular risks. Sudden death has been reported in patients with structural heart abnormalities, serious heart rhythm disorders, or coronary artery disease who took stimulants at standard doses. People with known serious cardiac conditions should not use this medication. For everyone else, a basic cardiovascular assessment (including questions about family history of sudden death and personal history of heart symptoms) is standard before starting treatment.
The drug raises blood pressure and heart rate in most people who take it. For those with normal cardiovascular health, these increases are usually small and clinically insignificant, but they should be monitored over time.
Who Should Not Take It
Beyond people with serious heart conditions, amphetamine/dextroamphetamine is not appropriate for anyone currently taking or who has recently taken a type of antidepressant called an MAOI (monoamine oxidase inhibitor). The combination can cause a dangerous spike in blood pressure. People with a history of stimulant misuse or active substance use disorder require careful risk assessment before starting treatment. The medication is also not recommended for children under 3.
Immediate-Release vs. Extended-Release
The immediate-release version typically lasts 4 to 6 hours and is often taken two or three times a day. The extended-release capsule is designed to last roughly 10 to 12 hours with a single morning dose. Both formulations are equally effective at reducing ADHD symptoms. The choice usually comes down to lifestyle: extended-release is more convenient and avoids the need for a midday dose (helpful for children in school or adults at work), while immediate-release offers more flexibility to adjust timing and allows for lower total daily doses if needed.