What side effects does Strattera (atomoxetine) commonly cause?
Strattera’s label includes side effects that are most often related to the stomach/brain systems. Commonly reported effects include nausea, decreased appetite, stomach pain, constipation, vomiting, dizziness, sleep problems (insomnia or sleepiness), fatigue, and mood changes such as irritability [1].
What serious side effects should I watch for?
Some Strattera side effects are less common but more urgent. Seek medical care promptly for signs of:
- Liver injury: yellowing of the skin/eyes (jaundice), dark urine, severe fatigue, or upper-right abdominal pain [1].
- Allergic reactions: rash, swelling, or trouble breathing [1].
- Worsening mental health: new or increased suicidal thoughts or behavior, or severe mood changes [1].
- Blood pressure/heart rate changes: feeling faint, chest pain, or a rapid/irregular heartbeat [1].
How does Strattera affect children vs. adults?
Many side effects overlap across age groups, but kids and teens may be monitored more closely for appetite, weight changes, and sleep effects because these can affect growth and daily functioning. Mood or behavioral changes also need prompt attention in children and adolescents [1].
Does Strattera cause appetite or weight loss?
Yes. Decreased appetite is a known side effect, and some people may lose weight as a result. Clinicians typically monitor appetite and weight during treatment [1].
Can Strattera affect sleep and energy?
Yes. Strattera can cause insomnia or sleepiness, and it may also cause fatigue or dizziness in some people. Adjusting the dosing time (if your prescriber recommends it) is sometimes used to manage sleep-related issues [1].
What sexual side effects or other less common effects have been reported?
Sexual side effects are not among the most common reports, but atomoxetine can affect neurotransmitter signaling and may lead to less common symptoms such as changes in libido or other neurologic complaints. If you notice new or concerning symptoms, discuss them with your prescriber rather than stopping on your own [1].
What should I do if I get side effects?
If side effects are mild, many clinicians manage them by monitoring, adjusting dose, or adjusting timing. If you have severe symptoms (especially liver-related signs, allergic reactions, chest pain, fainting, or suicidal thoughts), get urgent medical care and contact your prescriber immediately [1].
Who should be extra careful when starting Strattera?
Be especially cautious if you have a history of liver problems, significant heart disease, or prior mood/suicidality concerns. Your prescriber may monitor blood pressure, heart rate, weight/appetite, and mood more closely based on your risk profile [1].
Sources
- Strattera (atomoxetine) prescribing information, FDA