A “dexie” is a slang term for dextroamphetamine, a prescription stimulant most commonly used to treat ADHD and narcolepsy. The name comes from Dexedrine, one of the original brand names for the drug. Dexies belong to the amphetamine family and are classified as Schedule II controlled substances in the United States, meaning they have recognized medical uses but also a high potential for abuse and dependence.
What Dextroamphetamine Actually Does
Dextroamphetamine works by increasing levels of two key chemical messengers in the brain: dopamine and norepinephrine. Dopamine plays a central role in motivation, reward, and the ability to sustain attention. Norepinephrine helps with alertness and focus. In people with ADHD, these signaling systems tend to be underactive, which is why a stimulant can paradoxically have a calming, focus-sharpening effect rather than simply making someone feel “wired.”
The drug comes in two main forms. Immediate-release tablets kick in faster but wear off sooner, typically requiring multiple doses throughout the day spaced 4 to 6 hours apart. Extended-release capsules (historically called Spansules) are taken once in the morning. Research published in the Journal of the American Academy of Child and Adolescent Psychiatry found that the extended-release form had a less intense morning effect but lasted 3 to 6 hours longer than immediate-release versions, with measurable cognitive benefits persisting up to 12 hours after a single dose.
Approved Medical Uses
Dextroamphetamine is FDA-approved for two conditions. The first and most common is ADHD, where it’s prescribed for children as young as 3 (in immediate-release form) and adults of any age. The second is narcolepsy, a sleep disorder that causes sudden, uncontrollable episodes of daytime drowsiness. For adults with ADHD, a typical starting dose is 5 mg once or twice daily, gradually increased on a weekly basis. Most adults land somewhere between 5 and 40 mg per day, though extended-release formulations can go up to 60 mg daily.
You may recognize dextroamphetamine as one of the two active ingredients in Adderall, which combines it with a related compound called levoamphetamine. Dexedrine and its generics contain only dextroamphetamine, which is considered the more potent of the two forms. A transdermal patch version also exists for patients aged 6 and older.
Common Side Effects
Even at prescribed doses, dextroamphetamine can cause a range of side effects. The most frequently reported ones include nervousness, headache, dry mouth, nausea, constipation or diarrhea, weight loss, and changes in sex drive. Difficulty sleeping is extremely common, which is why doses are typically taken early in the day.
More serious effects require immediate medical attention. These include a fast or irregular heartbeat, chest pain, shortness of breath, fainting, sweating with dilated pupils, hostility or aggression, severe anxiety, and uncontrollable movements. The drug carries an FDA warning about the risk of sudden death in people with undiagnosed heart defects or serious heart conditions, in both children and adults. Heart attack and stroke are also listed as rare but possible outcomes, particularly in adults with pre-existing cardiovascular problems.
Dependence and Abuse Potential
Dextroamphetamine is habit-forming. Taking more than prescribed, or taking it more frequently, can lead to psychological and physical dependence. Signs that use has crossed into problematic territory include an abnormally excited mood, restlessness, irritability, loss of coordination, flushed skin, and a compulsive desire to keep taking the drug. The DEA places dextroamphetamine in the same scheduling category as methamphetamine and other high-risk stimulants, which means prescriptions come with refill restrictions and close monitoring.
Why “Dexies” Come Up Outside the Clinic
The slang term “dexie” is most often used in non-medical contexts, and for good reason. Prescription stimulant misuse is the most common form of stimulant abuse among young people today. College-age adults report using them to boost academic performance, get high, or amplify the effects of alcohol. Students in grades 7 through 12 cite similar motivations: improving concentration, raising grades, or counteracting the effects of other drugs.
These uses carry real risks beyond the side effects listed above. Combining prescription stimulants with alcohol is particularly dangerous, as studies have linked co-use to significantly higher rates of alcohol-related harm compared to drinking alone. Nonmedical stimulant use has also been associated with a broader pattern of substance use involving marijuana, cocaine, and ecstasy, though researchers haven’t fully untangled which comes first.
When used under medical supervision for a diagnosed condition, dextroamphetamine has decades of evidence supporting its safety and effectiveness. The risks escalate sharply when the drug is taken without a prescription, at higher-than-recommended doses, or in combination with other substances.