Bendroflumethiazide
Is It Right for You?
A complete guide to Bendroflumethiazide — what it treats, how it works, dosages, side effects, and when a clinician may prescribe it following an online consultation.
What Is Bendroflumethiazide?
Bendroflumethiazide is a thiazide diuretic (water tablet) used mainly to treat high blood pressure. It helps the kidneys remove excess salt and water from the body, which lowers blood pressure and reduces fluid retention.
It is a long-established medicine taken as a tablet, usually once a day in the morning. It is available generically and was previously known as bendrofluazide.
Bendroflumethiazide is a prescription-only medication in the UK. A licensed clinician must review your blood pressure and medical history before it can be prescribed - which can now be done conveniently through a telehealth consultation.
What Conditions Is Bendroflumethiazide Used For?
Bendroflumethiazide is prescribed for:
lowering raised blood pressure, often as a first-line or add-on treatment.
reducing swelling caused by conditions such as mild heart failure.
Because bendroflumethiazide increases urine production, taking it in the morning helps avoid the need to pass urine during the night.
How Does Bendroflumethiazide Work?
Bendroflumethiazide works on the kidneys, specifically the distal convoluted tubule. It blocks the reabsorption of sodium and chloride, so more salt - and the water that follows it - is passed out of the body in the urine.
Removing this excess fluid reduces the volume of blood the heart has to pump, which lowers blood pressure. Over longer-term use, it also relaxes the blood vessels, contributing to its effect.
Because it acts on the kidneys to alter salt balance, bendroflumethiazide can affect levels of potassium, sodium, and other electrolytes, which is why occasional blood tests are recommended.
Dosages & Administration
The correct dose depends on the type and severity of infection, age, weight, and kidney function. Always follow your clinician's instructions. The table below is for general reference only.
Administration Tips
Take in the morning to avoid needing to pass urine overnight.
Stay well hydrated in hot weather, but follow any fluid advice your clinician gives you.
Side Effects of Bendroflumethiazide
Side effects are usually mild at the low doses used for blood pressure. Some relate to changes in body salts.
- Passing more urine, especially at first
- Dizziness or light-headedness
- Mild tiredness
- Muscle cramps
- Increased thirst
- Severe muscle weakness or cramps (low potassium)
- Confusion or marked drowsiness (low sodium)
- A gout attack - painful, swollen joint
- Signs of dehydration
- Severe allergic skin reaction
Thiazide diuretics can raise uric acid levels and trigger gout in susceptible people. Tell your clinician if you have a history of gout before starting treatment.
Drug Interactions
Always disclose all prescription drugs, over-the-counter medicines, vitamins, and supplements to your clinician or pharmacist before starting bendroflumethiazide.
Bendroflumethiazide can reduce lithium excretion, raising it to toxic levels. Close monitoring is required if both are used.
Combined use enhances the blood-pressure-lowering effect, which is often intended but can cause dizziness.
Anti-inflammatory painkillers can reduce the diuretic effect and may affect kidney function.
Low potassium caused by the diuretic can increase the risk of digoxin toxicity.
Steroids and some other drugs can add to potassium loss. Your clinician may check your blood levels.
Important Warnings
Bendroflumethiazide can lower potassium and sodium and raise calcium and uric acid. Periodic blood tests help detect any imbalance, especially in older adults.
This medicine can raise uric acid and, at higher doses, blood sugar. Tell your clinician if you have gout or diabetes so your treatment can be monitored.
Bendroflumethiazide is less effective if kidney function is significantly reduced, and dehydration can worsen kidney function. Your clinician will assess this before prescribing.
Thiazide diuretics are generally avoided in pregnancy and breastfeeding. Tell your clinician if this applies to you so an alternative can be considered.
Speak to a Clinician About Treatment
Getting advice no longer means sitting in a waiting room. Through The GP Service, you can consult with a licensed clinician in minutes — from home, on your lunch break, or wherever works for you. If treatment is clinically appropriate, your clinician can issue a prescription during the consultation. A consultation does not guarantee a prescription.
The treatment you need, when you need it.
Bendroflumethiazide FAQs
Yes. A licensed clinician can review your blood pressure and history through a telehealth consultation and prescribe it if appropriate, alongside any recommended monitoring.
It increases urine production, so a morning dose means you are less likely to be woken at night needing to pass urine.
Occasional blood tests are recommended to check your kidney function and salt levels, particularly when you first start or change the dose.
Alcohol can add to the blood-pressure-lowering effect and increase dizziness. Moderate intake is usually acceptable - discuss your situation with your clinician.
Take it when you remember if it is still morning. If it is later in the day or almost time for the next dose, skip it - do not double up.
Any initial weight change is due to loss of excess fluid, not body fat. It is not a weight-loss medicine and should not be used for that purpose.