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What does it do?

Atomoxetine is used to treat ADHD (Attention Deficit Hyperactivity Disorder).

Before you start

  • Tell your doctor if you have liver, heart, or mental health problems, angle-closure glaucoma, or if you have ever had a seizure.
  • Tell your doctor if you are pregnant, planning to become pregnant, or breastfeeding.

How should you take it?

Take atomoxetine regularly as directed with a glass of water. You can take it with or without food.

What if you forget a dose?

If it is nearly time for your next dose, skip the missed dose and take your next dose at the usual time. Otherwise, take the missed dose as soon as you remember. Do not take two doses at the same time.

Can you take other medicines?

Tell your pharmacist or doctor about all medicines or treatments that you may be taking, including vitamins, herbal products or recreational drugs.

What side effects might you notice?

Side EffectsRecommended action

Symptoms of a fast or irregular heartbeat including: fluttering, pounding or pain in your chest, dizziness or fainting

Prolonged erection (longer than four hours)

Symptoms of liver problems including: yellow skin or eyes, itching, dark urine, pale bowel motions, abdominal pain

Eye pain, severe headache

Tell your doctor immediately

Unusual behaviour or thinking, agitation, mood changes

Trouble peeing

Tell your doctor

Headache, trouble sleeping, drowsiness

Shaking, tingling or numbness, tiredness or weakness

Sweating

Less interest in, or trouble having sex

Dry mouth, loss of appetite, weight loss, constipation, stomach upset

Tell your doctor if troublesome

If you notice any other effects, discuss them with your doctor or pharmacist.

Other information:

  • Atomoxetine can impair your ability to do tasks such as driving or using machines. Alcohol makes this worse. Discuss your risk with your health professional. (search NZTA - Are you safe to drive?)
  • Atomoxetine does not work straight away. It should start to work in about a month.
  • If you are having surgery, it is important to tell your doctor that you are taking atomoxetine.

This leaflet contains important, but not all, information about this medicine.

Prepared by the MyMedicines Committee at Christchurch Hospital, Te Whatu Ora - Waitaha, New Zealand. April 2026

For more general information about this sheet and its contents, see: What does a My Medicines sheet cover?

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About My Medicines

My Medicines Patient Information Leaflets (PILs) contain important, but not all, information about the medicines they describe.

For more information about the sheets, see: What does a My Medicines sheet cover?

My Medicines is developed by a team at Te Whatu Ora – Waitaha. Our team is made up of doctors, pharmacists, and a non-medical person to help us keep to plain language. We also discuss our information with specialist health professionals or groups when needed