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What does it do?

Terazosin is used to treat problems caused by an enlarged prostate, such as trouble peeing. It is also used for other conditions such as high blood pressure.

How should you take it?

Take terazosin regularly as directed with a glass of water.

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 terazosin including:

  • sildenafil (e.g. Viagra®) or similar 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

Chest pain

Prolonged erection (longer than four hours)

Tell your doctor immediately

Headache, dizziness

Change in heartbeat

Short of breath

Tell your doctor

Swollen feet or legs

Tiredness or weakness

Blurred vision

Runny or blocked nose

Stomach upset

Tell your doctor if troublesome

Lightheaded or dizzy after standing up

Stand up slowly. If it continues, or is severe, tell your doctor

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

Other information:

  • Tell your doctor if you have problems with dizziness, liver or heart problems, or prostate cancer.
  • Tell your doctor if you are pregnant, planning to become pregnant, or breastfeeding.
  • Terazosin may cause dizziness and make it dangerous to drive, operate machinery or do other activities that require you to be alert.
  • If you are having eye surgery (e.g. cataract operation), tell your doctor that you are taking terazosin.
  • Do not stop taking terazosin without talking to your doctor first.

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. April 2018

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 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