Indapamide
Is It Right for You?
A complete guide to Indapamide — what it treats, how it works, dosages, side effects, and when a clinician may prescribe it following an online consultation.
What Is Indapamide?
Indapamide is a thiazide-like diuretic used to treat high blood pressure. It helps the body remove a small amount of excess salt and water and also relaxes the blood vessels, both of which lower blood pressure.
It is taken as a tablet, usually once a day in the morning, and is available as a standard or modified-release form. It is available generically and under brand names such as Natrilix.
Indapamide 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 Indapamide Used For?
Indapamide is prescribed for:
lowering raised blood pressure, often recommended as a first-line option, particularly in older adults.
Indapamide has a mild diuretic effect, so taking it in the morning reduces the chance of needing to pass urine overnight.
How Does Indapamide Work?
Indapamide is closely related to thiazide diuretics. It acts on the kidneys to reduce the reabsorption of sodium, causing a modest increase in the amount of salt and water passed in the urine.
Beyond its diuretic action, indapamide directly relaxes the muscle in the walls of blood vessels, helping them widen. This vasodilator effect is an important part of how it lowers blood pressure.
Because it affects salt handling in the kidney, indapamide can alter potassium and sodium levels, which is why occasional blood monitoring is advised.
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.
Swallow modified-release tablets whole and do not crush or chew them.
Side Effects of Indapamide
Side effects are usually mild. Some relate to changes in the body's salt levels.
- Passing more urine at first
- Dizziness or light-headedness
- Tiredness
- Headache
- Muscle cramps
- Severe muscle weakness or cramps (low potassium)
- Confusion or marked drowsiness (low sodium)
- A gout attack - painful, swollen joint
- Irregular heartbeat
- Severe allergic skin reaction
Diuretics can occasionally cause low sodium levels, which is more common in older people and can cause confusion or drowsiness. Periodic blood tests help detect this.
Drug Interactions
Always disclose all prescription drugs, over-the-counter medicines, vitamins, and supplements to your clinician or pharmacist before starting indapamide.
Indapamide can reduce lithium excretion, raising it to toxic levels. Close monitoring is required if both are used.
Combined use increases the blood-pressure-lowering effect, which is often intended but can cause dizziness.
Anti-inflammatory painkillers can reduce the effect of indapamide and may affect kidney function.
Low potassium from the diuretic can increase the risk of digoxin toxicity.
Low potassium can add to the risk of rhythm disturbances with certain other drugs. Your clinician may monitor your blood levels.
Important Warnings
Indapamide can lower potassium and sodium levels. Periodic blood tests are recommended, especially in older adults and when starting or changing the dose.
Like thiazide diuretics, indapamide can raise uric acid and affect blood sugar. Tell your clinician if you have gout or diabetes.
Indapamide may be less effective or need extra caution if kidney or liver function is significantly reduced. Your clinician will assess this before prescribing.
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.
Indapamide FAQs
Yes. A licensed clinician can review your blood pressure and history through a telehealth consultation and prescribe indapamide if appropriate, alongside any recommended monitoring.
Although it has a mild diuretic effect, indapamide also relaxes blood vessels directly. At blood-pressure doses, this vessel-relaxing action is a major part of how it works.
Occasional blood tests are recommended to check kidney function and salt levels, particularly when starting treatment or changing 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, skip it and take your next dose as usual. Do not double up.
Blood pressure usually begins to fall within days, with the full effect developing over a few weeks of regular dosing.