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What does it do?

Oxybutynin is used to treat incontinence (peeing when you don't want to). It reduces the urge to pee and how often you pee.

How should you take it?

Take oxybutynin regularly as directed.
Take tablets with a glass of water.
Measure the liquid carefully with an oral syringe or measuring spoon.

What if you forget a dose?

Take the missed dose as soon as possible. If it is close to the time for your next dose, skip the missed dose and carry on as normal. Do not take two doses at the same time.

Can you take other medicines?

Some medicines available without a prescription may react with oxybutynin including:

  • some antihistamines (may be in anti-allergy, anti-nausea and cough/cold medicines)
  • meclozine (e.g. Sea-legs®)
  • prochlorperazine

Tell your pharmacist or doctor about all medicines or treatments that you may be taking, including vitamins, herbal products (e.g. St John's wort) or recreational drugs.

What side effects might you notice?

Side EffectsRecommended action

Fast or irregular heartbeat

Trouble peeing, pain when peeing

Tell your doctor immediately

Dry skin

Dry mouth, changes in taste, indigestion, abdominal pain, nausea, constipation or diarrhoea, farting

Dizziness, headache, drowsiness

Nervousness, confusion, trouble sleeping

Muscle weakness

Blurred vision, dry eyes

Swollen feet or legs

Tell your doctor if troublesome

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

Other information:

  • Tell your doctor if you have heart, thyroid, liver, lung, prostate, stomach, bowel or eye problems (glaucoma).
  • Tell your doctor if you have asthma, Parkinson’s disease, a chronic muscle condition (e.g. myasthenia gravis) or dementia.
  • Tell your doctor if you are pregnant, planning to become pregnant, or breastfeeding.
  • Oxybutynin 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?)
  • In hot weather and when exercising, you may need to increase your fluid intake to avoid over-heating, as oxybutynin may reduce the amount that you sweat.

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

Prepared by the PILs Committee at Christchurch Hospital, Canterbury District Health Board, New Zealand. January 2020

For more general information about this sheet annd 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 the Canterbury District Health Board. 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