Thiazide diuretics

Thiazide diuretics will help to lower your blood pressure. This reduces pressure on the walls of your arteries, making it easier for your heart to pump blood around your body. They may also help to decrease swelling.

Types of thiazide diuretics

  • bendroflumethazide e.g. Arrow-Bendrofluazide
  • amiloride e.g. Apo-Amiloride, Kaluril
  • chlorthalidone e.g. Hygroton
  • hydrochlorothiazide - usually used in conjunction with an ACE inhibitor e.g. Accuretic, Co-Renitec; or with an angiotensin II receptor e.g. Hypocart, Karvezide

How do they work?

Thiazide diuretics (water pills) make you pass urine more often, removing excess fluids from your body. 

What's the catch?

You may experience some unwanted side effects when taking a thiazide diuretic. These can include:

  • muscle cramps
  • tiredness
  • dark urine
  • constipation
  • dry mouth
  • bruising easily
  • sickness
  • diarrhoea or constipation
  • raised blood sugar
  • gout
  • dizziness.

These medications can change the level of potassium in your blood.

If you have concerns about any of these unwanted side effects, talk to your doctor, nurse or other health professional.

It's important to take your diuretics as prescribed, because taking too many may damage your kidneys.

What should I look out for?

The important symptoms are listed above. If you experience these symptoms, please get in touch with your doctor.

Because thiazide diuretics make you go to the toilet more, you may like to consider taking them in the morning instead of bedtime. It is okay to adjust the time you take them so that they cause less disruption to your life, talk to your doctor or pharmacist about how you can do this safely.

Related treatments and conditions

Blood pressure

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