Viloxazine: what it treats, how to take it, side effects
Last updated September 3, 2026.
Viloxazine is a selective norepinephrine reuptake inhibitor - a non-stimulant ADHD medicine that raises norepinephrine, a brain substance needed to control behavior. You may know it as Qelbree. It carries a warning worth reading twice.
What does it treat?
ADHD - attention deficit hyperactivity disorder - in children and adults.
How do you take it?
Once a day, exactly as directed - the capsule can be opened and sprinkled for kids who cannot swallow pills. Doses adjust over weeks. Never stop suddenly without your doctor. Missed dose: take it when you remember unless the next one is close; never double up.
Side effects to know
- Common: sleepiness, decreased appetite, nausea, vomiting, trouble sleeping, irritability - mostly early, mostly fading.
- Serious - call your doctor right away: the behavior warning - children and teenagers taking viloxazine are more likely to think about suicide than those not taking it: watch especially at the start and after any dose change for acting subdued or withdrawn, feeling helpless or worthless, new or worsening depression, talk of self-harm, extreme worry, agitation, panic attacks, sleep trouble, irritability, aggression, acting without thinking, or frenzied excitement.
Who should not take it?
Depression, bipolar disorder, or suicidal thinking - your child's or the family's - goes on the table before the first dose, along with high blood pressure and heart, liver, or kidney disease. Teachers, siblings, and caregivers become watchers too: ask them to report behavior changes. If suicidal thinking arrives, call or text 988 - the Suicide and Crisis Lifeline - any hour.
When is it an emergency?
Any talk or sign of self-harm is a same-day doctor call - and 988 any hour. For an overdose, call Poison Control at 1-800-222-1222. Pymander's escalation routing is built and tested specifically for this class of decision; see the safety architecture working paper.
What a Pymander AI doctor consult looks like
Illustrative example, not a real member's messages.
Common questions
What is the warning about?
The boxed warning: studies show children and teenagers with ADHD taking viloxazine are more likely to think about suicide than those not taking it. The watch protocol: highest attention at the start and after every dose change; everyone around the child - siblings, teachers, caregivers - becomes a watcher. The symptoms that trigger an immediate doctor call: withdrawal, hopelessness, new or worsening depression, any self-harm talk, agitation, panic, aggression, or frenzied excitement. 988 - the Suicide and Crisis Lifeline - is there any hour.
Why a non-stimulant for ADHD?
A different road to the same destination: viloxazine raises norepinephrine without being a stimulant - no controlled-substance schedule, no stimulant side-effect profile, and a fit for kids who cannot take or do not respond to stimulants. The trade: it builds over weeks rather than working the first morning. The choice between stimulant and non-stimulant is a real fork - history, other conditions, and response decide it.
What are the common side effects?
Sleepiness, decreased appetite, nausea, vomiting, trouble sleeping, irritability - mostly front-loaded into the first weeks and mostly fading. The appetite dip deserves actual meals: a solid breakfast before the dose, real food at the times hunger shows up. Effects that persist past the first weeks go on the doctor's list.
Can the capsule be opened?
Yes - viloxazine capsules can be opened and the contents sprinkled for children who cannot swallow pills - one of its practical advantages. The full contents go in, one dose at a time. Your pharmacist shows the technique once; after that it is a ten-second ritual.
How long until it works?
Weeks, not days: the norepinephrine effect builds - early weeks are about side effects settling and dose finding, and the focus gains arrive gradually. The school is often the better measuring instrument: teachers see the attention in its natural habitat. The diary plus the teacher note is the evidence pair.
What happens if my child misses a dose?
Give it when you remember unless the next dose is close - never double up. Once-daily anchors - breakfast routine, backpack check - keep the question rare. Never stop suddenly without the doctor: the exit is a planned taper, not an empty bottle.