Adderall (Amphetamine Salts).
What It Does, Side Effects, and What to Expect.

Adderall is a brand name for mixed amphetamine salts -- a combination of amphetamine and dextroamphetamine. It is one of the most prescribed medications for ADHD in the United States and one of the most searched medication names online. Here is a clear picture of what it actually does, how the different forms compare, what side effects to watch for, and how it compares to alternatives like Vyvanse and Concerta.

What Is Adderall?

Adderall contains a blend of amphetamine salts that work by triggering the release of dopamine and norepinephrine in the brain -- not just blocking their reuptake, but actively flooding the synapse with them. This is a stronger mechanism than methylphenidate (Ritalin, Concerta), which only blocks reuptake. The result is more focused attention, better impulse control, and reduced hyperactivity in people with ADHD.

FDA-approved uses:

• Attention-deficit/hyperactivity disorder (ADHD) -- both IR and XR
• Narcolepsy -- IR formulation

Adderall IR vs. Adderall XR: What Is the Difference?

Adderall IR (immediate release) -- takes effect in 30 to 60 minutes and lasts 4 to 6 hours. Comes in tablets. Can be taken multiple times daily to cover specific windows (work hours, evening study, etc.). More control over timing, but requires remembering multiple doses.

Adderall XR (extended release) -- a capsule with beads that release medication in two waves: roughly 50% immediately and 50% released later. Duration is approximately 8 to 10 hours from a single morning dose. Covers most of the work or school day without a midday dose. If needed, XR capsules can be opened and the beads sprinkled on food.

Most adults use XR for daily coverage. IR is useful as a supplement (a short "booster" in the afternoon) or for people who need precise control over when the medication is active.

How Long Does It Take to Work?

Adderall begins working within 30 to 60 minutes for both forms. Unlike antidepressants, stimulants work immediately -- you and your provider should have a clear sense of whether it is helping on the first or second dose at a given level. If it is not helping or is causing significant side effects at one dose, the dose needs to be adjusted.

Finding the right dose is a process. Most providers start low (5 to 10 mg) and increase gradually every 1 to 2 weeks based on effect and tolerability. The therapeutic range for adults is typically 10 to 60 mg daily total dose.

Common Side Effects

• Appetite suppression -- one of the most consistent effects. Many people are not hungry during peak medication hours and need to be intentional about eating. This can cause weight loss, particularly at higher doses.
• Insomnia -- taking XR too late in the day is the most common cause. Typically take XR before 10am. Even then, some people find it affects sleep.
• Increased heart rate and blood pressure -- mild increases are expected; more significant in people with existing cardiovascular conditions
• Dry mouth
• Headache -- especially during the wear-off period
• "Crash" or rebound when the medication wears off -- irritability, fatigue, or mood dip. More pronounced with IR; XR reduces this but does not eliminate it.
• Worsened anxiety -- amphetamines increase norepinephrine, which is the same system activated in anxiety. For people with co-occurring anxiety, this can be a limiting factor.

Cardiovascular Considerations

Adderall raises heart rate and blood pressure. Most healthy adults tolerate this well. However, it is generally avoided or used with close monitoring in people with:

• Structural heart conditions
• Uncontrolled hypertension
• History of arrhythmia
• Recent heart attack or stroke

A provider should take a cardiac history and, if any concerns exist, may request cardiac clearance before prescribing.

Adderall vs. Vyvanse

Both are amphetamine-based. The key difference is that Vyvanse is a prodrug that must be metabolized in the body before becoming active. This creates a smoother onset and longer, steadier duration (10 to 14 hours) with less of the crash. Vyvanse also has significantly lower abuse potential because it cannot be altered for non-oral use. See our Vyvanse guide for more.

Adderall vs. Concerta/Ritalin

Concerta and Ritalin use methylphenidate, which blocks dopamine and norepinephrine reuptake rather than triggering their release. Methylphenidate tends to be slightly milder and is often tried first in people with anxiety. Some people respond better to amphetamines; others to methylphenidate -- individual brain chemistry matters here.

Is Adderall Addictive?

When taken as prescribed by someone with ADHD, at therapeutic doses, the risk of addiction is low. ADHD itself increases the risk of substance use disorders, and treatment with stimulants actually reduces that risk over time. However, non-prescribed use, higher-than-therapeutic doses, or use by someone without ADHD can lead to misuse. This is why it is a controlled substance requiring a prescription.