Qelbree Side Effects: What to Expect and When to Call Your Doctor

What to Know About Qelbree Side Effects

Starting a new medication always comes with questions — and side effects are usually at the top of the list. If you or your child has been prescribed Qelbree (Viloxazine) for ADHD, understanding what's normal and what's not can help you feel more confident about treatment.

This guide covers the most common side effects reported in clinical trials, the serious ones to watch for, and practical tips for managing them.

What Is Qelbree?

Qelbree is a non-stimulant medication approved by the FDA to treat ADHD in patients 6 years and older, including adults. It's made by Supernus Pharmaceuticals and works as a selective norepinephrine reuptake inhibitor (SNRI). Unlike stimulants such as Adderall or Ritalin, Qelbree is not a controlled substance, which means it has a lower risk of misuse. For a deeper look at how it works, see our guide on Qelbree's mechanism of action.

Common Side Effects

The following side effects were reported most frequently in clinical trials. Most are mild to moderate and tend to improve within the first few weeks of treatment:

• Sleepiness/somnolence — One of the most common, especially in children. This is why Qelbree is typically taken in the morning.
• Decreased appetite — Similar to stimulants, though usually less pronounced
• Nausea — More common in the first week or two
• Vomiting — Particularly in pediatric patients
• Fatigue — General tiredness, separate from sleepiness
• Insomnia — Some patients experience difficulty sleeping, especially at higher doses
• Irritability — More commonly reported in children and adolescents
• Headache — Usually mild and temporary
• Dry mouth — More common in adults
• Constipation — More common in adults

Most of these side effects are dose-dependent, meaning they're more likely at higher doses. Your doctor will typically start you at a lower dose and increase gradually to reduce the chance of side effects.

Serious Side Effects

While uncommon, Qelbree does carry some serious risks that you should be aware of.

Suicidal Thoughts and Behaviors (Boxed Warning)

Qelbree carries an FDA boxed warning — the most serious type of warning — for increased risk of suicidal thoughts and behaviors. This risk applies to children, adolescents, and adults, particularly during the first few months of treatment or after dose changes.

Watch for these warning signs:

• New or worsening depression or anxiety
• Feeling agitated, restless, or irritable
• Panic attacks
• Trouble sleeping (new or worse)
• Aggressive or violent behavior
• Talking about or attempting self-harm

If you notice any of these signs in yourself or your child, contact your doctor immediately or call 988 (Suicide and Crisis Lifeline).

Increased Heart Rate and Blood Pressure

Qelbree can cause increases in heart rate and blood pressure. Your doctor should check your vitals before starting treatment and monitor them periodically. Let your doctor know if you have a history of heart problems.

Manic Episodes

In rare cases, Qelbree may trigger manic or hypomanic episodes, especially in patients with a history of bipolar disorder. Symptoms include racing thoughts, decreased need for sleep, risky behavior, and unusually elevated mood.

Allergic Reactions

Seek emergency medical help if you experience hives, swelling of the face or throat, or difficulty breathing after taking Qelbree.

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Side Effects in Specific Populations

Children (Ages 6–11)

In clinical trials, the most common side effects in children were somnolence, decreased appetite, and vomiting. Children may also experience more irritability than adults.

Adolescents (Ages 12–17)

Side effect profiles in teens are similar to children, with somnolence and decreased appetite being the most frequent. The suicidal thoughts boxed warning is especially important to discuss with adolescent patients and their families.

Adults

Adults tend to report more nausea, insomnia, dry mouth, and constipation compared to pediatric patients. Fatigue and headache are also common.

Pregnancy

Qelbree should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus. Talk to your doctor if you are pregnant or planning to become pregnant.

How to Manage Side Effects

Here are some practical strategies that may help:

• For sleepiness: Take Qelbree in the morning. If drowsiness is severe, talk to your doctor about adjusting the dose.
• For nausea: Taking Qelbree with food may help, though it can be taken with or without food. Nausea often improves after the first week or two.
• For decreased appetite: Eat a good breakfast before the medication kicks in. Offer nutrient-dense snacks later in the day, especially for children.
• For insomnia: Make sure you're taking it in the morning, not later in the day. Practice good sleep hygiene — consistent bedtime, no screens before bed.
• For dry mouth: Stay hydrated, chew sugar-free gum, or use a saliva substitute.
• For constipation: Increase fiber intake, drink plenty of water, and stay physically active.

Don't stop taking Qelbree without talking to your doctor first, even if side effects are bothersome. Your doctor may be able to adjust the dose or suggest ways to manage symptoms.

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When to Call Your Doctor

Contact your doctor right away if you experience:

• Suicidal thoughts or behavior changes (call 988 in an emergency)
• Signs of a manic episode
• Rapid heartbeat or chest pain
• Severe allergic reaction
• Side effects that are severe or don't improve after 2–3 weeks

Final Thoughts

Every medication comes with trade-offs, and Qelbree is no different. For many patients, the benefits of better focus and symptom control outweigh the side effects, which are usually mild and temporary. The key is to stay in close communication with your doctor, especially during the first few months.

If you've been prescribed Qelbree and need help finding it in stock, Medfinder can show you which pharmacies near you carry it. For more about how Qelbree compares to other options, check out our guide on Qelbree alternatives.