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Chlorthalidone: uses, side effects & brands
Chlorthalidone is a long-acting thiazide-like diuretic for blood pressure. It belongs to the Diuretic (water tablet) group. Diuretics help the body remove excess salt and water, lowering blood pressure and reducing swelling.
Drug type — dosing is set by your doctor
| Measure | Range |
|---|---|
| Drug class | Diuretic (water tablet) |
| Type | Prescription |
| Dose | Individual — ask your doctor or pharmacist |
What it is used for
- High blood pressure
- Fluid retention (oedema)
- Often combined with other blood pressure tablets
Common brand names
- India: Ctd, Chlortha
- Worldwide: Thalitone, Hygroton
Common side effects
- Passing more urine
- Dizziness
- Low potassium or sodium
- Raised uric acid (gout) or blood sugar
Before taking it — precautions
- Take it in the morning to avoid night-time toilet trips
- Blood salts, kidney function and sugar are checked
- Tell your doctor about gout, diabetes, kidney or liver disease
When to see a doctor urgently
- Severe dizziness, confusion or muscle cramps (low salts or dehydration)
- Irregular heartbeat or severe weakness (low potassium)
- Severe rash or swelling of the face (urgent)
Frequently asked questions
How is chlorthalidone different from hydrochlorothiazide?
Both are thiazide-type water tablets, but chlorthalidone lasts longer in the body, giving steady blood-pressure control.
Will chlorthalidone make me pass urine a lot?
You may pass more urine for some hours after a dose, especially at first. Taking it in the morning helps.
Why are blood tests needed?
It can lower potassium and sodium and raise uric acid and sugar, so these are checked.
Explore more
Sources & further reading
- World Health Organization (WHO)
- MedlinePlus — U.S. National Library of Medicine
- Ministry of Health & Family Welfare, India
- Indian Council of Medical Research (ICMR)
Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.