Strattera (Atomoxetine) Side Effects: A Complete Guide

Strattera is one of the most effective non-stimulant options for ADHD — but like any medication, it comes with side effects worth knowing about. This guide walks you through everything from the everyday stuff (upset stomach, drowsiness) to the rare but serious warning signs you should never ignore. The more you know going in, the better prepared you'll be.

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Strattera works differently from stimulant ADHD medications. As a selective norepinephrine reuptake inhibitor (SNRI), it affects the brain gradually over weeks rather than hours — which is part of why its side effects have a different character than something like Adderall or Ritalin. (For a deeper look at how Strattera actually works, see what is Strattera.)

Most people tolerate Strattera reasonably well, especially once their body adjusts. But knowing what to expect — and what to watch for — makes a real difference in sticking with the medication long enough to see whether it works for you.

Let's break it all down.

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Common Side Effects (and How Often They Happen)

These are the side effects that show up most frequently in clinical trials and real-world use. Most are dose-related, meaning they're more likely at higher doses, and many improve after the first few weeks.

Digestive Issues

This is the most commonly reported category.

• Nausea — affects approximately 26% of adults and up to 35% of children
• Decreased appetite — affects approximately 16–24% of patients
• Stomach pain or upset — affects approximately 18% of children
• Vomiting — affects approximately 11% of children, less common in adults
• Constipation — affects approximately 8% of adults

What helps: Take Strattera with food. This won't affect how the medication works, but it can significantly reduce nausea. Starting at a lower dose and increasing gradually also tends to make the stomach side effects much more manageable. For most people, nausea improves meaningfully within two to four weeks as the body adjusts.

Mood and Sleep Changes

• Insomnia or sleep problems — affects approximately 15% of patients
• Irritability or mood swings — affects approximately 11% of children
• Fatigue or tiredness — affects approximately 9% of adults

What helps: Timing matters. If Strattera makes you drowsy, taking it at night can actually turn a nuisance into a benefit. If it's disrupting your sleep or making you more irritable, talk to your doctor — adjusting the dose or timing often helps.

Dry Mouth and Physical Symptoms

• Dry mouth — affects approximately 20% of adults
• Increased heart rate (mild) — affects approximately 6–8% of patients
• Mild increase in blood pressure — affects approximately 5% of patients
• Dizziness — affects approximately 8% of adults
• Headache — affects approximately 19% of adults

What helps: Staying hydrated and using sugar-free gum or lozenges can ease dry mouth. For dizziness, standing up slowly (especially in the morning) makes a noticeable difference. If your heart rate or blood pressure changes feel significant, check in with your doctor before your next scheduled visit.

Sexual Side Effects (Adults)

These affect adults more than children.

• Decreased libido — affects approximately 4% of adults
• Erectile dysfunction — affects approximately 8% of men
• Urinary hesitation or difficulty — affects approximately 8% of adults

These can be frustrating and are often underreported. Don't suffer in silence — your doctor has options.

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Side Effects That Usually Go Away vs. Those That Can Persist

This is one of the most useful things to understand about Strattera side effects: timing tells you a lot.

Typically Improve Within 2–4 Weeks

• Nausea
• Stomach pain
• Headaches
• Fatigue
• Initial irritability or mood changes

May Persist (or Need Active Management)

• Decreased appetite (especially in children — your doctor will likely monitor weight)
• Dry mouth
• Sleep difficulties
• Sexual side effects in adults
• Small increases in heart rate or blood pressure

If you're still dealing with the "should resolve" symptoms after a month, that's worth bringing up with your doctor. It may mean the dose needs adjusting or Strattera isn't the right fit — not that you simply have to push through it.

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Serious Side Effects: Know the Warning Signs

These side effects are less common but require medical attention. They don't necessarily mean you need to stop Strattera immediately — but you should contact your doctor promptly.

Liver Problems

Rare but important. Signs of liver problems include:

• Yellowing of the skin or eyes (jaundice)
• Dark urine
• Persistent nausea or upper-right abdominal pain
• Unusual fatigue
• Loss of appetite that's more severe than typical

Strattera-related liver injury is uncommon — reported in a very small number of patients — but it can escalate quickly if ignored. If you notice jaundice or dark urine, don't wait for your next appointment. Call your doctor that day.

Cardiovascular Effects

Strattera can cause small but meaningful increases in heart rate and blood pressure in some patients. More serious cardiovascular concerns include:

• Chest pain or discomfort
• Shortness of breath
• Heart palpitations that feel strong or prolonged
• Fainting or near-fainting

If you have a pre-existing heart condition, your doctor should know before you start Strattera, and your heart rate and blood pressure should be monitored regularly.

Mood and Psychiatric Changes

Strattera carries an FDA warning about psychiatric side effects, particularly in children and adolescents. Watch for:

• New or worsening anxiety
• Agitation or aggressive behavior
• Psychosis or hallucinations (very rare)
• Manic episodes (especially in patients with a history of bipolar disorder)

If you or your child experiences any of these, contact your doctor right away. In some cases, this can mean Strattera isn't the right medication — and there are alternatives worth exploring (alternatives to Strattera).

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Rare but Dangerous Side Effects

These are uncommon, but they warrant their own section because the stakes are high if they're missed.

Suicidal Thoughts (FDA Black Box Warning)

Strattera carries a black box warning — the FDA's most serious warning — about the risk of suicidal thinking in children, adolescents, and young adults during the first few months of treatment or after dose changes.

This doesn't mean Strattera causes suicide. It means this age group requires close monitoring during the adjustment period.

Warning signs to watch for:

• Talking about wanting to die or to hurt themselves
• Withdrawal from friends and family
• Giving away possessions
• Dramatic mood changes
• New or worsening depression

If you see any of these signs in a child or young adult on Strattera, take it seriously and act immediately. Call their doctor or go to the emergency room.

For adults, the risk appears lower, but mood monitoring is still recommended during the first few months.

Allergic Reactions

Severe allergic reactions to Strattera are rare but possible. Signs include:

• Rash, hives, or swelling
• Difficulty breathing
• Swelling of the face, lips, tongue, or throat

This is an emergency situation. Call 911 or go to the ER immediately.

Priapism

This is an uncommon but serious side effect in males — a prolonged, painful erection unrelated to sexual stimulation. If this occurs and lasts longer than two hours, seek emergency care. Left untreated, priapism can cause permanent damage.

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When to Call Your Doctor vs. Go to the ER

It's worth being clear about this, because not every side effect requires a 3 AM trip to the emergency room — but some genuinely do.

Call Your Doctor (Within 24–48 Hours)

• Nausea or stomach problems that don't improve after two weeks
• Persistent sleep problems or mood changes
• Signs of liver issues (fatigue, nausea, pain — without jaundice)
• Increasing heart rate or blood pressure readings at home
• Sexual side effects that are affecting quality of life
• Your child is losing significant weight

Call Your Doctor Urgently (Same Day)

• Yellowing of skin or eyes
• Increasing agitation or aggressive behavior
• New or worsening depression
• Any psychiatric symptoms that feel unusual or sudden

Go to the ER or Call 911

• Suicidal thoughts or behavior (in any age group)
• Chest pain, fainting, or difficulty breathing
• Severe allergic reaction (throat swelling, inability to breathe)
• Priapism lasting more than two hours

When in doubt, err on the side of caution. A phone call to your doctor's after-hours line is always a reasonable first step.

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Drug Interactions That Can Worsen Side Effects

Some of Strattera's side effects can be amplified by other medications. MAOIs, for example, are a serious and dangerous combination. Several antidepressants, blood pressure medications, and even some over-the-counter products can interact with atomoxetine in ways that matter.

For the full picture on what not to combine with Strattera, see Strattera drug interactions.

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Practical Tips for Managing Common Side Effects

You don't have to just white-knuckle through the adjustment period. These evidence-based strategies can make a real difference:

For nausea:

• Always take with food (a small snack is fine)
• Avoid taking on an empty stomach, even in the morning
• Ginger tea or ginger chews can help mild nausea
• If severe, ask your doctor about splitting the dose

For appetite suppression:

• Schedule meals rather than relying on hunger cues
• Focus on calorie-dense, nutritious foods at breakfast before the medication fully kicks in
• For children, evening meals and weekend "catch-up" eating are important

For sleep problems:

• Try morning dosing if you're having insomnia
• Try evening dosing if daytime drowsiness is the issue
• Consistent sleep and wake times help

For dry mouth:

• Carry a water bottle
• Sugar-free gum or candy helps stimulate saliva
• Avoid alcohol and caffeine, which make dry mouth worse

For dizziness:

• Stand up slowly, especially after sitting or lying down for a while
• Drink enough water throughout the day
• If dizziness is significant, check your blood pressure and share the readings with your doctor

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FAQ

How long do Strattera side effects last?

For most people, the uncomfortable early side effects — especially nausea, headaches, and fatigue — improve meaningfully within the first two to four weeks. Your body is adjusting to how the medication changes norepinephrine levels in your system. If you're still struggling after a month, talk to your doctor about adjusting the dose rather than stopping cold turkey.

Is it normal to feel worse before feeling better on Strattera?

It can feel that way, yes. Because Strattera builds up in your system over time (it takes four to eight weeks to see full therapeutic effects), some people notice side effects before they notice benefits. That lag is frustrating but normal. Keeping a simple journal of symptoms during the first month can help you and your doctor see the real picture.

Can Strattera cause weight loss?

Appetite suppression is real with Strattera, and yes, some patients — especially children — do lose weight. Your doctor should monitor your child's weight and height regularly. In adults, weight loss is generally modest. If it's significant or concerning, bring it up with your doctor.

Does everyone experience sexual side effects on Strattera?

No. Sexual side effects affect a minority of adult patients — roughly 4–8% depending on the specific symptom. They're more common in adults than in children, and they're worth discussing openly with your doctor. Adjusting the dose or timing can sometimes help, and if not, switching medications is a reasonable conversation to have.

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