💊 Stimulant vs. Nonstimulant ADHD Medications: How to Choose

By Dr. Justin Nepa, DO | Board-Certified Psychiatrist | Refresh Psychiatry and Therapy

An estimated 16.13 million adults in the United States are currently living with ADHD — about 6.2% of the adult population — and many are navigating the same question: which type of medication is right for me?

If you have been recently diagnosed, or if your current medication is not working the way you hoped, you have likely come across two broad categories of ADHD treatment: stimulant medications and nonstimulant medications. Both are FDA-approved. Both can be highly effective. But they work differently, feel different in your body, and come with different trade-offs.

This guide breaks down everything you need to know — how each class works, what the side effects look like, when one may be a better fit than the other, and what to expect if you switch between them. The goal is to help you have a more informed conversation with your psychiatrist about the best path forward for you.

How ADHD Medications Work: The Brain Science in Plain English

ADHD is primarily a disorder of executive function — the brain's ability to prioritize, plan, sustain attention, and regulate impulses. At the neurochemical level, ADHD involves lower-than-optimal activity of two key neurotransmitters: dopamine and norepinephrine.

Dopamine plays a central role in motivation, reward, and the ability to sustain focus on tasks that are not inherently stimulating. Norepinephrine supports alertness, attention, and emotional regulation.

All ADHD medications — whether stimulant or nonstimulant — work by increasing the availability of one or both of these neurotransmitters. The difference lies in how they do it, how quickly they take effect, and the side effect profile that comes along for the ride.

Stimulant Medications: What You Need to Know

Stimulants have been the first-line treatment for ADHD for over 60 years. They remain the most widely prescribed and most extensively studied class of ADHD medications, and for good reason — they work for approximately 70 to 80 percent of people who try them.

There are two main families of stimulant medications:

Amphetamine-Based Stimulants

• Adderall / Adderall XR (mixed amphetamine salts) — The most widely prescribed ADHD medication in the US for both adults and children

• Vyvanse (lisdexamfetamine) — A prodrug that must be converted in the body, providing smoother onset and lower abuse potential

• Dexedrine (dextroamphetamine)

• Mydayis (mixed amphetamine salts, triple-bead extended release)

Amphetamines work by actively pushing more dopamine and norepinephrine into the synaptic space between neurons while simultaneously blocking their reuptake. This dual action is why amphetamines tend to feel more potent.

Methylphenidate-Based Stimulants

• Ritalin / Ritalin LA (methylphenidate)

• Concerta (methylphenidate extended release)

• Focalin / Focalin XR (dexmethylphenidate)

• Jornay PM (methylphenidate, taken at night for morning symptom control)

• Daytrana (methylphenidate patch)

Methylphenidates work primarily by blocking the reuptake of dopamine and norepinephrine — meaning they prevent these neurotransmitters from being recycled too quickly, allowing them to stay active longer. They do not actively push more into the system the way amphetamines do.

Stimulant Side Effects

Common side effects of stimulant medications include:

• Decreased appetite and weight loss — Often the most noticeable side effect, especially in the first few weeks

• Insomnia or difficulty falling asleep — Particularly with longer-acting formulations taken too late in the day

• Increased heart rate and blood pressure — Typically mild, but important to monitor

• Jitteriness or anxiety — More common with higher doses or in people who also experience an anxiety disorder

• Afternoon "crash" — A dip in focus and mood as the medication wears off, particularly with immediate-release formulations

Because stimulants are classified as Schedule II controlled substances, they also carry a potential for misuse. This does not mean everyone who takes them is at risk, but it is a factor your psychiatrist will consider — especially if there is a history of substance use.

The Stimulant Shortage Problem

One challenge that is impossible to ignore in 2026: medication shortages. According to CDC data, 71.5% of adults taking stimulant ADHD medications had difficulty getting their prescription filled in the past 12 months. If this has happened to you, you are not alone — and it is one more reason to understand your nonstimulant options.

Nonstimulant Medications: What You Need to Know

Nonstimulant ADHD medications exist for the 20 to 30 percent of people who do not respond well to stimulants, cannot tolerate the side effects, or have reasons that make stimulants a poor fit. But they are also a strong first-line choice in certain situations.

Nonstimulants work differently from stimulants. They primarily target norepinephrine without directly ramping up dopamine activity the way stimulants do. The result is a smoother, more gradual effect — no "on switch," no crash, and no controlled substance scheduling.

FDA-Approved Nonstimulant Options

Strattera (atomoxetine) — The first FDA-approved nonstimulant for ADHD, available in both brand and generic. Strattera is a selective norepinephrine reuptake inhibitor (SNRI) that increases norepinephrine availability in the brain. It can take 4 to 6 weeks to reach full effect and works around the clock, including mornings before you would typically take a stimulant.

Qelbree (viloxazine) — A newer nonstimulant approved for both children (ages 6+) and adults. Qelbree is also a selective norepinephrine reuptake inhibitor, but clinical data shows it works noticeably faster than Strattera — with symptom improvement in as little as 1 to 2 weeks. In head-to-head comparisons, patients showed greater improvement in both inattention and hyperactivity-impulsivity with Qelbree, and discontinuation rates due to side effects were significantly lower (4% for Qelbree vs. 36% for Strattera).

Intuniv (guanfacine extended release) — An alpha-2 adrenergic agonist originally developed for blood pressure. Intuniv is FDA-approved for ADHD in children and adolescents and is frequently used off-label in adults. It is particularly helpful for managing emotional reactivity, impulsivity, and hyperarousal — symptoms that stimulants sometimes do not fully address.

Kapvay (clonidine extended release) — Similar to Intuniv in its mechanism, Kapvay is another alpha-2 agonist that can be used alone or in combination with stimulants. It can be especially useful for ADHD-related sleep difficulties because it has a calming effect.

Nonstimulant Side Effects

Common side effects of nonstimulant medications include:

• Fatigue or drowsiness — Particularly with guanfacine and clonidine, especially early in treatment

• Nausea and stomach upset — More common with atomoxetine and viloxazine

• Headaches

• Decreased blood pressure — With alpha-2 agonists (the opposite of stimulant effects)

• Mood changes — Atomoxetine carries an FDA black box warning for suicidal ideation in children and young adults, which is why close monitoring during the first few months is important

Notably, nonstimulants typically do not cause appetite suppression, insomnia, or jitteriness — which are the most common reasons people stop taking stimulants.

Stimulant vs. Nonstimulant: Side-by-Side Comparison

How they work: Stimulants increase dopamine + norepinephrine directly. Nonstimulants primarily increase norepinephrine; some modulate alpha-2 receptors.

Time to effect: Stimulants take 30–60 minutes. Nonstimulants take 1–6 weeks depending on the medication.

Overall response rate: Stimulants work for 70–80% of patients. Nonstimulants work for 40–65%, though this gap is narrowing with newer options.

Duration of action: Stimulants last 4–16 hours depending on formulation. Nonstimulants provide 24-hour continuous coverage.

Abuse potential: Stimulants are Schedule II controlled substances with abuse potential. Nonstimulants are not controlled substances and carry no abuse risk.

Appetite and sleep: Stimulants commonly cause appetite suppression and insomnia. Nonstimulants rarely affect appetite and some may actually cause drowsiness.

Medication shortages: Stimulant shortages are significant (71.5% of adults reported difficulty filling prescriptions). Nonstimulant shortages are minimal.

When Your Provider Might Recommend One Over the Other

Choosing between stimulant and nonstimulant ADHD medications is not one-size-fits-all. Your psychiatrist will consider your complete clinical picture. Here are some of the most common scenarios:

Stimulants May Be the Better Starting Point If:

• You need rapid symptom relief and cannot wait several weeks for medication to take effect

• You have no history of substance use concerns

• You do not have significant co-occurring anxiety

• Your ADHD symptoms significantly impair daily functioning and you need the highest-probability first option

Nonstimulants May Be the Better Starting Point If:

• You experience anxiety alongside your ADHD — stimulants can sometimes make anxiety worse, while nonstimulants like Strattera and Qelbree may actually help

• You have a history of substance use — nonstimulants carry zero abuse potential

• You have cardiovascular concerns — nonstimulants (especially alpha-2 agonists) can actually lower blood pressure rather than raise it

• Stimulant side effects are intolerable — appetite loss, insomnia, or jitteriness that does not resolve with dose adjustments

• You need 24-hour symptom coverage — nonstimulants work around the clock, including early mornings and late evenings

• You are experiencing stimulant shortages and need a reliable alternative

Combination Therapy: Using Both Together

Here is something most blogs do not mention: stimulants and nonstimulants are not always an either/or decision. Many people benefit from taking both.

A common combination is a stimulant for core attention and focus paired with a nonstimulant like Intuniv for emotional regulation and hyperarousal. This approach can address a broader range of ADHD symptoms than either medication alone.

Your psychiatrist may recommend combination therapy when a single medication provides partial improvement — for example, your focus is better on a stimulant, but you still experience emotional reactivity, difficulty winding down at night, or residual impulsivity.

What to Expect When Starting or Switching Medications

Whether you are starting your first ADHD medication or switching from one class to another, knowing what to expect can reduce anxiety and help you stay the course.

Starting a Stimulant: Most people notice effects on the first day. Your psychiatrist will typically start at a low dose and increase gradually — a process called titration — to find the dose that provides the best symptom relief with the fewest side effects. This usually takes 2 to 4 weeks of adjustments.

Starting a Nonstimulant: Patience is key. Unlike stimulants, nonstimulants build up in your system over time. You may not notice meaningful changes for 1 to 2 weeks with Qelbree or 4 to 6 weeks with Strattera. It is important to take the medication consistently and not give up too early. Many people who ultimately have a great response to nonstimulants initially felt like "nothing was happening."

Switching Between Classes: If you are switching from a stimulant to a nonstimulant (or vice versa), your provider will create a transition plan. In many cases, there is an overlap period where you take both while the new medication reaches therapeutic levels. Never stop a medication abruptly without guidance from your prescriber — particularly with nonstimulants like Intuniv and Kapvay, which require gradual tapering.

Getting ADHD Treatment Through Telehealth in Florida

If you are located anywhere in Florida, you can receive a full ADHD evaluation and medication management through telehealth — including prescriptions for stimulant medications.

Under Florida Statute §456.47, licensed providers can conduct psychiatric evaluations, diagnose ADHD, and prescribe all FDA-approved ADHD medications through live video appointments. This means you do not need to drive to a clinic, take time off work, or sit in a waiting room.

At Refresh Psychiatry and Therapy, our initial ADHD evaluations are typically 45 to 60 minutes and include a structured clinical interview, review of standardized ADHD rating scales, screening for co-occurring conditions, and a thorough discussion of medication options tailored to your specific needs and preferences.

Whether you are in Davie, Miami, Orlando, Jacksonville, Tampa, or anywhere else in Florida — our providers can see you from the comfort of your home.

Frequently Asked Questions

Can you take a stimulant and nonstimulant ADHD medication together?

Yes. Combination therapy is a well-established approach in psychiatry. A common example is adding a nonstimulant like guanfacine (Intuniv) to a stimulant like Adderall to help manage residual symptoms such as emotional reactivity or difficulty winding down at night. Your psychiatrist may recommend combination therapy when a single medication provides partial improvement but does not fully address all of your symptoms.

How long do nonstimulant ADHD medications take to work?

It depends on the specific medication. Qelbree (viloxazine) tends to work fastest, with studies showing symptom improvement within 1 to 2 weeks. Strattera (atomoxetine) typically requires 4 to 6 weeks of consistent use before you notice the full benefit. Intuniv and Kapvay generally fall somewhere in between at 2 to 4 weeks. Because results are gradual, it is important to stay consistent and maintain regular follow-ups with your psychiatrist.

Are nonstimulant medications less effective than stimulants?

On a population level, stimulants have higher overall response rates — approximately 70 to 80 percent compared to 40 to 65 percent for nonstimulants. However, "less effective on average" does not mean less effective for you. Some people respond better to nonstimulants, particularly those who experience anxiety alongside ADHD or cannot tolerate stimulant side effects. Newer nonstimulants like Qelbree have shown strong results, and the gap between the two classes continues to narrow.

What should I do if my stimulant medication is unavailable due to shortages?

Contact your psychiatrist right away — do not simply stop taking your medication. Your provider may be able to prescribe an equivalent medication from a different manufacturer, switch you to a different stimulant formulation, or recommend temporarily adding or switching to a nonstimulant. A telehealth appointment makes it easy to address this quickly without waiting for an in-person visit.

Can I get ADHD medication prescribed through telehealth in Florida?

Yes. Under Florida law, licensed healthcare providers can conduct psychiatric evaluations, diagnose ADHD, and prescribe medications — including Schedule II controlled stimulants — through telehealth. At Refresh Psychiatry, we offer telepsychiatry appointments to patients located anywhere in Florida.

Take the Next Step

Choosing the right ADHD medication does not have to be overwhelming. The most important step is working with a psychiatrist who takes the time to understand your symptoms, your history, and your goals — so you get a treatment plan that actually fits your life.

Ready to find the right approach for you? Contact us or call Refresh Psychiatry at (954) 603-4081 to schedule your evaluation.

We accept Aetna, United Healthcare, Cigna, Blue Cross Blue Shield, UMR, and Oscar insurance plans.

This blog is for informational purposes only and does not constitute medical advice. Please consult a qualified mental health professional for personalized guidance.