Amphetamine/dextroamphetamine is a prescription stimulant medication used primarily to treat ADHD and, less commonly, narcolepsy. You probably know it by its most recognizable brand name, Adderall. The medication contains a specific blend of amphetamine salts designed to improve focus, attention, and impulse control by increasing the activity of certain chemical messengers in the brain.
What’s Actually in the Medication
The name “amphetamine/dextroamphetamine” reflects the fact that this drug is a mixture of two closely related compounds. Dextroamphetamine is the “right-handed” molecular form of amphetamine, while levoamphetamine is the “left-handed” form. These two versions of the same molecule affect the brain slightly differently. Dextroamphetamine has stronger effects on focus and attention, while levoamphetamine contributes more to physical effects like increased alertness and energy.
The medication combines these in a 3:1 ratio favoring dextroamphetamine, spread across four different salt forms: dextroamphetamine saccharate, amphetamine aspartate monohydrate, dextroamphetamine sulfate, and amphetamine sulfate. These different salts dissolve at slightly different rates, which helps smooth out how the drug is absorbed into your bloodstream.
How It Works in the Brain
Amphetamine/dextroamphetamine increases the levels of two key brain chemicals: dopamine and norepinephrine. Dopamine plays a central role in motivation, reward, and the ability to sustain attention on a task. Norepinephrine helps with alertness and the ability to respond to important signals while filtering out distractions.
In people with ADHD, the circuits that rely on these chemicals tend to be underactive. The medication pushes more dopamine and norepinephrine into the gaps between nerve cells and also slows the rate at which those chemicals get recycled back into the cell that released them. The net effect is that signals in attention-related brain circuits get louder and more consistent, which is why people with ADHD often describe feeling “quieter” mentally when the medication is working, not wired or hyped up.
Immediate-Release vs. Extended-Release
The medication comes in two main formulations. Immediate-release tablets (sold as generic Adderall or its equivalents) kick in within about 30 to 45 minutes and last roughly 3 to 6 hours. Most people take these two or three times a day to maintain coverage through the day.
Extended-release capsules (Adderall XR and generics) are designed to release the medication in two phases, providing 8 to 12 hours of coverage from a single morning dose. The capsule contains two types of beads: one set dissolves immediately, and the other dissolves about four hours later. This eliminates the midday dose that many people find inconvenient or forget, and it also avoids the noticeable “wearing off” that can happen between doses of the immediate-release version.
Who It’s Prescribed For
The FDA has approved amphetamine/dextroamphetamine for two conditions: ADHD and narcolepsy. The vast majority of prescriptions are for ADHD in children, adolescents, and adults. For ADHD, the extended-release version is approved for children ages 6 and older, while the immediate-release tablets can be prescribed to children as young as 3, though this is less common.
Typical starting doses vary by age. Children ages 6 to 12 generally start at 5 or 10 mg once daily for the extended-release version, with a maximum recommended dose of 30 mg per day. Adolescents ages 13 to 17 typically start at 10 mg daily, and adults usually begin at 20 mg daily. Doses are adjusted gradually based on how well symptoms improve and how well the person tolerates the medication.
Common Side Effects
The most frequently reported side effects are decreased appetite, trouble sleeping, headache, stomachache, nervousness, and dizziness. Appetite suppression is particularly common and tends to be strongest in the hours the medication is most active. Many people find their appetite returns in the evening as the drug wears off. Sleep problems are usually managed by taking the medication early enough in the day that it clears the system before bedtime.
Because stimulants raise heart rate and blood pressure slightly, your prescriber will typically check your cardiovascular health before starting treatment and monitor it periodically. Dry mouth, irritability, and mild weight loss are also common, especially in the first few weeks. Most side effects are dose-dependent, meaning they tend to improve if the dose is reduced.
Serious psychiatric side effects are rare. In pooled clinical trial data, new onset of psychotic symptoms like hallucinations or delusional thinking occurred in about 0.1% of children and adolescents taking stimulants at standard doses.
Important Safety Considerations
Amphetamine/dextroamphetamine is not appropriate for everyone. People with certain heart conditions, including structural heart defects, serious irregular heartbeats, or advanced hardening of the arteries, are generally advised not to take it. A family history of sudden cardiac death or serious heart rhythm problems is also something your prescriber needs to know about before writing this prescription.
One critical drug interaction involves a class of antidepressants called MAO inhibitors. If you’ve taken an MAO inhibitor within the past 14 days, amphetamine/dextroamphetamine should not be used. The combination can cause a dangerous spike in blood pressure and other serious effects.
The medication is classified as a Schedule II controlled substance, the same category as oxycodone and morphine. This means prescriptions cannot be called in by phone in most states, refills require a new prescription each time, and there are limits on how much can be dispensed at once. These restrictions exist because amphetamines carry a risk of misuse and physical dependence, particularly at doses higher than those prescribed for ADHD.
What It Feels Like When It’s Working
People with ADHD who respond well to the medication often describe the effect as being able to choose what to pay attention to, rather than having their focus pulled in every direction. Tasks that previously felt impossible to start become approachable. Conversations are easier to follow. The mental effort required to do routine things like paperwork, chores, or studying drops noticeably.
The effect is not subtle for most people. Within the first few days of finding the right dose, the difference is often clear. That said, the medication treats symptoms only while it’s active in the body. It doesn’t cure ADHD or produce lasting changes in brain chemistry after it wears off, which is why it’s taken daily. Some people use it only on workdays or school days, while others take it every day depending on how much ADHD affects their overall functioning.