Dexedrine is a prescription stimulant used to treat two conditions: attention deficit hyperactivity disorder (ADHD) in children ages 6 to 17, and narcolepsy, a sleep disorder that causes overwhelming daytime drowsiness. Its active ingredient is dextroamphetamine sulfate, a potent form of amphetamine that works by increasing the activity of certain chemical messengers in the brain.
ADHD Treatment in Children and Teens
Dexedrine is FDA-approved for ADHD in patients ages 6 through 16, where it helps increase attention and reduce impulsiveness and hyperactivity. It’s meant to be one piece of a broader treatment plan that typically includes psychological, educational, and social support. The medication alone isn’t intended as a standalone fix.
The standard starting dose for children 6 and older is 5 mg once or twice daily, with increases of 5 mg per week until the right balance of benefit and side effects is found. Most people don’t need more than 40 mg per day. While the FDA approval covers pediatric patients, doctors also prescribe dextroamphetamine to adults with ADHD, though this falls outside the labeled age range.
Managing Narcolepsy
For people with narcolepsy, Dexedrine reduces the frequency of sleep attacks, those sudden, uncontrollable episodes of falling asleep during the day. In clinical trials, dextroamphetamine at doses of 10 to 45 mg per day reduced the number of sleep attacks, though it did not help with cataplexy (the sudden muscle weakness some narcolepsy patients experience).
Narcolepsy treatment often combines medication with behavioral strategies. A well-timed 20-minute nap around 1 or 2 PM can improve alertness for one to three hours, sometimes reducing how much medication a person needs in the afternoon. Newer medications have emerged for narcolepsy, but dextroamphetamine remains an option, particularly when other treatments haven’t worked well enough.
How Dexedrine Works in the Brain
Dexedrine increases the levels of dopamine and norepinephrine, two neurotransmitters involved in focus, motivation, and wakefulness. It does this in multiple ways at once: it triggers the release of these chemicals into the spaces between brain cells, blocks their reabsorption back into the cell that released them, and slows down the enzymes that break them down. The net effect is more dopamine and norepinephrine available to do their jobs, which translates to better concentration in ADHD and greater wakefulness in narcolepsy.
Available Formulations
Dexedrine comes in two forms. The immediate-release tablet reaches peak levels in the blood about 3 hours after you take it. The sustained-release capsule (called Spansule) releases the medication gradually, reaching peak levels around 8 hours after dosing. Both forms have the same half-life of roughly 12 hours, meaning it takes about that long for half the drug to clear your system. The sustained-release version hasn’t been shown to work better than the immediate-release version taken in divided doses throughout the day; it simply offers convenience.
How Dexedrine Differs From Adderall
Dexedrine contains only dextroamphetamine, the more potent of the two amphetamine forms. Adderall is a blend of dextroamphetamine and levoamphetamine in a 3:1 ratio. Because Adderall includes levoamphetamine, it has stronger effects on the peripheral nervous system, which can mean more physical side effects like increased heart rate or blood pressure for some people. Dexedrine’s pure dextroamphetamine composition makes it milligram-for-milligram stronger in terms of its brain effects, so doses tend to be slightly lower than equivalent Adderall doses.
Off-Label Uses
Doctors sometimes prescribe dextroamphetamine for conditions beyond ADHD and narcolepsy. The most established off-label uses include treatment-resistant depression (particularly in older adults who haven’t responded to standard antidepressants) and cognitive recovery after traumatic brain injury. Less commonly, it may be used for fatigue in neurological conditions, excessive daytime sleepiness when other medications haven’t helped, and PTSD.
Some uses are generally discouraged by experts, including weight loss (despite amphetamines’ appetite-suppressing effects), cognitive enhancement in healthy people, and apathy in dementia, where the evidence is thin and the risks often outweigh any potential benefit.
Common Side Effects
The most frequently reported side effects include decreased appetite, trouble sleeping, headache, dry mouth, fast heartbeat, stomach upset, weight loss, dizziness, and tremors. Many of these are most noticeable when starting the medication or after a dose increase, and they often improve over time.
In children, growth suppression is a real concern. Studies of children ages 7 to 10 on stimulant medication found that those treated consistently (seven days a week, year-round) grew about 2 cm less in height and gained about 2.7 kg less in weight over three years compared to unmedicated peers. No growth rebound was observed during that period, which is why regular monitoring of height and weight is standard practice.
Stimulants also cause modest cardiovascular changes in most people: an average blood pressure increase of 2 to 4 mmHg and heart rate increase of 3 to 6 beats per minute. Some individuals experience larger changes. Psychotic or manic symptoms are rare, occurring in about 0.1% of patients on stimulant medications in pooled trial data.
Who Should Not Take Dexedrine
Dexedrine is contraindicated in two situations: people with a known allergy to amphetamines (allergic reactions including severe swelling and anaphylaxis have been reported), and people taking MAO inhibitors or who have taken them within the past 14 days. Combining dextroamphetamine with MAO inhibitors creates a risk of dangerously high blood pressure.
As a Schedule II controlled substance, Dexedrine is classified by the DEA as having a high potential for abuse that may lead to severe psychological or physical dependence. Prescriptions typically cannot be refilled and require a new prescription each time, with limits on how much can be dispensed at once.