ADHD medications explained

What ADHD medications are

ADHD medications are used to treat attention-deficit hyperactivity disorder, usually shortened to ADHD. ADHD involves ongoing problems with attention, and often with hyperactivity and impulsivity, that interfere with daily life. Medication is one part of treatment. It does not cure ADHD, but for many people it reduces the core symptoms enough to make a real difference at school, at work, and at home.

These medications fall into two groups. Stimulants are one group, and non-stimulants are the other. Stimulants are the most effective and the most commonly used. Non-stimulants are an alternative that suits some people better, and they are sometimes used alongside a stimulant.

How they work

Stimulants work on two chemical messengers in the brain, dopamine and norepinephrine. Nerve cells use these messengers to pass signals to one another, and both play a part in attention and self-control. Stimulants increase how much of these messengers stay available between cells. Methylphenidate-based stimulants mainly do this by slowing reuptake, the reabsorption of a messenger by the cell that released it. Amphetamine-based stimulants slow reuptake and also increase how much the cells release. The two families work in slightly different ways, but the practical result is the same, steadier attention and less hyperactivity and impulsivity. Because this change happens quickly, stimulants work the day a person takes them.

Non-stimulants work differently and more gradually. Atomoxetine and viloxazine act mainly on norepinephrine. Guanfacine is an alpha-2 adrenergic agonist, which means it acts on a particular set of receptors in a part of the brain involved in attention and impulse control. None of the non-stimulants produce the rapid, dose-by-dose effect that stimulants do.

How the class developed

Stimulants have the longest history of the medications used for attention. Amphetamine's use for attention goes back the furthest, into the 1930s. Methylphenidate, sold as Ritalin, came into use through the 1950s and 1960s. By the time formal ADHD diagnoses were common, stimulants already had decades of clinical use behind them. They remain the most studied and most effective ADHD treatment.

The first non-stimulant developed specifically for ADHD, atomoxetine, was approved in 2002. Before that, the alternatives to stimulants were medications borrowed from other uses. Guanfacine, for example, started as a blood pressure medication, and an extended-release form was later approved for ADHD. Viloxazine, a newer non-stimulant, was approved more recently. The arrival of dedicated non-stimulants gave prescribers options for people who cannot take stimulants or do not do well on them.

What they are used for

The main use of these medications is ADHD in children, adolescents, and adults. Stimulants are the first-line choice for most people because they work well and work quickly. Non-stimulants are used when a stimulant is not a good fit, and sometimes alongside one.

Some of these medications have other approved uses. Several stimulants are also approved for narcolepsy, a sleep disorder. Lisdexamfetamine is also approved for moderate to severe binge eating disorder in adults. Those uses are outside the scope of this guide, which focuses on ADHD.

What they have in common

The medications in both groups share a few features.

• All of them treat the core symptoms of ADHD, which are inattention, hyperactivity, and impulsivity.
• None of them cure ADHD. They manage symptoms while they are being taken.
• For all of them, finding the right medication, formulation, and dose is usually a process of adjustment with a prescriber. Regular check-ins help, especially early on and for children, whose growth is tracked over time.
• Response is individual. A poor response to one medication does not mean another will not work.

How they differ from each other

The clearest difference is between the two groups.

Stimulants are fast-acting. Many people notice an effect on the first day, often within about an hour. For most people they are the most effective option. They are Schedule II controlled substances, the category for medications that have a recognized medical use and also a high potential for misuse. They carry an FDA boxed warning about a potential for misuse, abuse, and addiction. Within the stimulant group, methylphenidate-based and amphetamine-based medications work in slightly different ways, and some people respond better to one family than the other.

Non-stimulants are slower to take effect. They build their benefit over several weeks of daily use, more like an antidepressant than a stimulant. They are not controlled substances and do not carry the same misuse potential. They tend to be chosen when stimulants are not suitable or not well tolerated, when controlled-substance concerns matter, or as an add-on alongside a stimulant. Among them, atomoxetine and viloxazine act on norepinephrine, while guanfacine tends to be calming and is often added to a stimulant to help with hyperactivity and impulsivity.

How a prescriber chooses one

For most people, a prescriber starts with a stimulant, because stimulants are the most effective option. The next question is the formulation. Short-acting forms cover part of the day, while long-acting forms give smoother coverage from morning into the evening. The starting dose is usually low and adjusted based on how symptoms respond and how the medication is tolerated.

A non-stimulant may be chosen first when stimulants are not suitable. That can be the case when stimulant side effects are hard to tolerate, when anxiety or another condition makes a stimulant a poor fit, when there are concerns about misuse, or when a person prefers a medication that is not a controlled substance. A non-stimulant is also sometimes added alongside a stimulant when a stimulant alone does not cover everything.

Because response is individual, finding the right medication, formulation, and dose is usually a process. It can take a few adjustments, and a poor result with one option does not predict the result with the next.

A note on access

Because stimulants are controlled substances, the rules for prescribing them are stricter. The prescription cannot be refilled in the usual way, so a new prescription is needed each time. Rules for prescribing controlled substances, including through telehealth, are tighter than for most medications and can vary by state. This is a routine part of stimulant treatment, not a sign of any problem, but it means planning ahead so a person does not run out. Non-stimulants are not controlled substances, so they can be refilled in the usual way.

The medications in this class

• Methylphenidate (Ritalin, Concerta). A stimulant and one of the two main stimulant families. It works fast and comes in short-acting and long-acting forms.
• Amphetamine (Adderall). A stimulant made of a mix of amphetamine salts. It works fast and comes in short-acting and long-acting forms.
• Lisdexamfetamine (Vyvanse). An amphetamine-based stimulant in a long-acting form. It is a prodrug, inactive until the body converts it, which gives a smooth, long effect from one morning dose.
• Atomoxetine (Strattera). A non-stimulant that works on norepinephrine. It is not a controlled substance and takes several weeks to reach full effect.
• Guanfacine (Intuniv). A non-stimulant that works through a different receptor and tends to be calming. It is not a controlled substance and is often added to a stimulant.
• Viloxazine (Qelbree). A newer non-stimulant taken every day. It is not a controlled substance.

PsychiatryRx has dedicated guides for methylphenidate, amphetamine, lisdexamfetamine, atomoxetine, and guanfacine, with more detail on uses, side effects, dosing, and what to expect.

Common questions

Are ADHD stimulants safe? Stimulants have a long record as an effective ADHD treatment for children and adults when used as prescribed and monitored by a clinician. They carry a boxed warning about misuse and are controlled substances, and they can raise heart rate and blood pressure, which is why a prescriber asks about heart history before starting. Used as directed, they are considered safe and effective for most people.

What is the difference between stimulants and non-stimulants? Stimulants work fast, often the same day, are the most effective option for most people, and are controlled substances. Non-stimulants build their effect over several weeks of daily use, are not controlled substances, and are chosen when stimulants are not suitable or are added alongside one.

Is one stimulant better than another? Not in general. Methylphenidate-based and amphetamine-based stimulants are both effective. Response is individual, so some people do better on one family than the other. A prescriber may try the alternative if the first choice does not work well or is not well tolerated.

Are ADHD medications addictive? Stimulants have a recognized potential for misuse, which is why they are controlled substances with a boxed warning. Taken as prescribed and monitored by a clinician, they have a long record as a safe ADHD treatment, and risk is higher when they are misused or taken in ways other than directed. Non-stimulants are not controlled substances and do not carry that misuse potential.

Sources

This guide draws on current prescribing information and public health references. It is reviewed for clinical accuracy and updated as guidance changes.

1. U.S. Food and Drug Administration. Prescribing information.
2. MedlinePlus, U.S. National Library of Medicine.
3. National Institute of Mental Health. Mental health medications.