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Bendroflumethiazide is a drug that uses the active ingredient of the same name. It belongs to a group of medication known as thiazide diuretics and reduces fluid retention by increasing the amount of urine the body produces.

We do not offer treatment for fluid retention through our online clinic service. If you are experiencing symptoms, we recommend that you see your GP in person.

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PLEASE NOTE: This treatment is not available through our online pharmacy service. This page is for information only. If you are experiencing any of the symptoms related to the condition(s) this medication treats, we strongly recommend that you see your GP in person.
Product information

Bendroflumethiazide is used to treat high blood pressure as well as fluid retention, also known as oedema. The tablets, often referred to as ‘water tablets’, are produced by global pharmaceutical brand Actavis  and are only available in the UK on prescription.

  1. Combats high blood pressure and fluid retention
  2. One tablet a day or less
  3. Effective generic medication

Oedema or fluid retention is caused by a buildup of excess liquid resulting in the affected area looking swollen and puffy. Other symptoms can include skin discolouration, aching limbs, weight gain or loss, stiff joints and a higher than normal blood pressure or pulse rate. It can affect anyone at any time in their life. However, women are more commonly affected than men, this is thought to be because the female hormone progesterone can encourage the body to retain fluid. The condition is also more often seen in the elderly population which could be due to a decrease in activity.

Fluid retention can develop for a number of reasons. It can occur as a symptom of an underlying health condition, as a result of an injury or for no known medical reason. People who stand or sit for long periods of time may notice some foot or ankle swelling at the end of the day, this is known as peripheral oedema. This is fairly common, whereas fluid retention symptoms are often persistent and can be found in other parts of the body. Medications that have been known to cause oedema include; hypertension treatment, corticosteroids and the contraceptive pill. Health conditions such as pregnancy, heart failure, liver disease, kidney disease, thyroid disease, chronic lung disease and malnutrition can also result in fluid retention.

Some milder cases of fluid retention can resolve on their own. Making small changes to your lifestyle can help such as; avoiding standing up for too long, raising your legs throughout the day, regularly exercising, eating a healthy low-salt diet and losing weight if you are overweight. Fluid retention symptoms should not be ignored as they may be a result of a more serious underlying health condition. In these cases your doctor may advise treatment in the form of Bendroflumethiazide tablets.

The swollen areas appear due to excess fluid forming in either the blood cells or the bonding tissue around the blood vessels, known as the interstitium. The active ingredient, bendroflumethiazide, falls into the category of medicines known as thiazide diuretics. They work in the kidneys by drawing extra potassium and sodium out of the body’s blood stream. These salts then extract any excess water with them and pass it into the urine where it is expelled from the body. By removing the retained fluid the swollen area reduces in size, usually returning back to it’s normal appearance. Where treatment does not resolve your symptoms, further medical advice should be sought from your doctor.

Fluid retention medication is not available through our online service.

If you think you may be experiencing symptoms of fluid retention, we strongly recommend that you see your doctor in person, to rule out any other medical conditions that may be causing it.

Page last reviewed:  28/09/2020


As with all medications you should adhere to the instructions provided by your doctor. Full compliance can help you achieve the best results from the treatment and reduce the chance of side effects.

  1. These tablets should be swallowed with water in the morning. This is to reduce the likelihood of needing to urinate during the night. 
  2. Your doctor will provide specific dosage instructions for you and your condition. 
  3. If you forget to take a tablet you should not double-up your dose. Take the tablet as soon as you remember and then resume your usual schedule.

Please bear in mind that these instructions are only a brief guide. You should follow the information provided by your doctor and refer to the patient information leaflet, if required.

Download PDF

Page last reviewed:  28/09/2020
Please read the patient information leaflet for this medicine fully before use:

Bendroflumethiazide 2.5mg

Bendroflumethiazide 5mg

Side effects & Warnings

Side effects

It important that you are aware of the potential side effects and reactions when using Bendroflumethiazide. If you experience any of the following you should contact your doctor or other health care professional immediately.

Frequency unknown:
Rash, sensitivity to light, viral lung infection, increased bruising or nosebleeds, sickness, diarrhoea, constipation or lowered tolerance to carbohydrates.

This is not a comprehensive list of the potential side effects caused by this product. Please refer to the patient information guide or ask your prescriber for more details.

Taking it with other medicines

Thiazide diuretic treatments can interact with some other products. Therefore it is important that you fully disclose any other medications that you are currently, or have recently been using when consulting with your doctor.

Conditions to look out for

This item may not be suitable for you if you have any of the following conditions: impaired kidney or liver function, gout, addison’s disease, hypercalcaemia, hyponatremia, refractory hypokalaemia, diabetes, systemic lupus erythematosus (SLE), porphyria, lactose intolerance or alcoholic cirrhosis.

Page last reviewed:  28/09/2020
Please read the patient information leaflet for this medicine fully before use:

Bendroflumethiazide 2.5mg

Bendroflumethiazide 5mg


Can I still drink alcohol?

Alcohol may increase your blood pressure and consequently decrease the effectiveness of this medication. You should consult your prescribing doctor before drinking alcohol whilst using this product.

Will I still be able to drive?

These tablets can cause dizziness, it is therefore prudent to assess the effects of the medication before deciding to drive or operate machinery.

Can I take the medicine while pregnant?

You should check with your doctor before taking this product if you are pregnant or breastfeeding.

How should I store it?

Keep all medications out of sight and reach of children. Store in a cool, dry place out of direct sunlight.

Am I allergic to anything in the medicine?

If you are known to be allergic to any of the following ingredients then you should not take this product: bendroflumethiazide, lactose, magnesium stearate, maize starch, pregelatinised maize starch, stearic acid.

Is it available over-the-counter?

No. This medication can only be issued following consultation with a doctor.

Is it right for me?

If you are seeking treatment for fluid retention, it is important to make an appointment with your doctor. Once they have assessed your symptoms, they will be able to make a recommendation on the most suitable treatment option.


Page last reviewed:  28/09/2020
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