Dextroamphetamine is a prescription stimulant used to treat two conditions: attention deficit hyperactivity disorder (ADHD) and narcolepsy. It’s classified as a Schedule II controlled substance, meaning it has legitimate medical uses but also carries a high potential for abuse and dependence. You may recognize it by the brand name Dexedrine, though generic versions are widely available in both immediate-release tablets and extended-release capsules.
ADHD Treatment
The primary reason dextroamphetamine is prescribed is ADHD. It’s FDA-approved for children and adolescents ages 6 to 17, though doctors also prescribe it to adults. The medication works by increasing levels of two chemical messengers in the brain: dopamine and norepinephrine. It does this in two ways, by triggering more of these chemicals to be released into the spaces between nerve cells and by preventing them from being reabsorbed too quickly. The net effect is improved focus, reduced impulsivity, and better control over attention.
For children 6 and older, the typical starting dose is 5 mg once or twice daily. Doctors usually increase the dose by 5 mg each week until the right balance of symptom relief and side effects is found. Most people don’t need more than 40 mg per day. The immediate-release form reaches peak levels in the blood about three hours after taking it, while extended-release capsules spread the effect over a longer window so the medication doesn’t need to be taken as frequently during the day.
Narcolepsy Treatment
Narcolepsy is a neurological condition that causes overwhelming daytime sleepiness and, in some cases, sudden episodes of muscle weakness triggered by emotions. Dextroamphetamine helps by promoting wakefulness, though current treatment guidelines generally consider it a second-line option for adults. Newer medications with fewer cardiovascular side effects are typically tried first. Still, dextroamphetamine remains a useful tool when those options aren’t effective enough or aren’t tolerated well.
Narcolepsy rarely appears in children under 12, but when it does, dextroamphetamine is approved for use starting at age 6. Children between 6 and 12 typically start at 5 mg daily, with increases of 5 mg per week. Those 12 and older start at 10 mg daily, with weekly increases of 10 mg. The effective dose range for narcolepsy is broad, from 5 to 60 mg per day in divided doses, depending on how severe the sleepiness is and how the individual responds.
Off-Label Uses
Doctors sometimes prescribe dextroamphetamine for conditions beyond its two approved uses. One area of interest is a rare form of obesity called hypothalamic obesity, which occurs when damage to a specific part of the brain disrupts the body’s ability to regulate hunger, energy expenditure, and weight. This type of weight gain is notoriously resistant to diet and exercise alone. Amphetamines both suppress appetite and increase the body’s resting calorie burn, which makes them a potential option when standard approaches fail.
In one study of 19 children with hypothalamic obesity, dextroamphetamine was started at 5 mg daily and gradually increased. Earlier case series found that weight either stabilized or decreased in the majority of children treated, with 10 out of 12 seeing improvement in one study and all seven patients responding in another. Researchers have also noted that many of these children experienced less daytime sleepiness, which may have helped them become more physically active. These uses remain off-label, and treatment is typically tried for three to six months to see whether an individual responds.
How It Feels: Common Side Effects
The most frequently reported side effects reflect the drug’s stimulant nature. Many people experience some combination of dry mouth, decreased appetite, weight loss, headache, and nervousness, particularly when first starting or increasing the dose. Constipation, nausea, and diarrhea can also occur. Changes in sex drive are sometimes reported. These effects are often mild and may lessen as your body adjusts.
More serious side effects are less common but worth knowing about. These include rapid or irregular heartbeat, seizures, new or worsening tics, significant mood changes (including depression or mania), hallucinations, and unusual suspiciousness. Circulation problems can occasionally cause fingers or toes to feel numb, painful, or appear pale or bluish. Any of these warrant prompt medical attention.
Who Should Not Take It
Dextroamphetamine is not appropriate for everyone. It’s contraindicated in people with significant cardiovascular problems, including advanced hardening of the arteries, structural heart abnormalities, serious arrhythmias, coronary artery disease, and uncontrolled high blood pressure. People with narrow-angle glaucoma should also avoid it, because stimulants can increase pressure inside the eye. The medication can worsen severe anxiety or agitation, so it’s generally not used when those symptoms are prominent.
Because dextroamphetamine is a Schedule II substance, prescriptions come with tighter controls than most medications. Refills are more restricted, and your doctor will need to write a new prescription periodically rather than authorizing automatic refills. This classification reflects both the genuine medical utility of the drug and the real risks of misuse, which is why ongoing monitoring is a standard part of treatment.