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What does it do?

Ethambutol is an antibiotic used with other medicines to treat tuberculosis (TB).

Before you start

  • Tell your doctor if you have kidney or eye problems.
  • Tell your doctor if you are pregnant, planning to become pregnant, or breastfeeding.
  • Ethambutol may cause eye problems. You will need an eye test before you start, and maybe while you are taking it.

How should you take it?

Take ethambutol regularly as directed with a glass of water. You can take it with or without food. Keep taking it until the course is finished.
It is important to take it regularly. If you often forget to take it, it may not work as well.

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

Eye pain, changes in vision

Tell your doctor immediately

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

Other information:

  • Ethambutol is not registered for use in New Zealand. Discuss with your doctor.

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 2025

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