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Spironolactone: uses, side effects & brands
Spironolactone is a potassium-sparing diuretic used in heart failure, fluid and hormone conditions. 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
- Heart failure
- High blood pressure that is hard to control
- Fluid in the tummy from liver disease
- Hormone conditions with too much aldosterone
- Sometimes acne or excess hair growth in women
Common brand names
- India: Aldactone, Spiromide
- Worldwide: Aldactone, CaroSpir
Common side effects
- Breast enlargement or tenderness (in men and women)
- Raised blood potassium
- Dizziness or tiredness
- Irregular periods
Before taking it — precautions
- Avoid potassium supplements and salt substitutes unless your doctor agrees
- Kidney function and potassium are checked regularly
- Tell your doctor about ACE inhibitors, ARBs or pain killers (NSAIDs) you take; avoid in pregnancy
When to see a doctor urgently
- Muscle weakness, numbness or irregular heartbeat (high potassium — urgent)
- Severe dizziness, confusion or very little urine
- Severe rash or swelling of the face (urgent)
Frequently asked questions
Why can spironolactone cause breast swelling?
It blocks male hormone effects, which can cause breast enlargement in men. Tell your doctor — an alternative such as eplerenone may be considered.
Do I need to avoid bananas and other potassium foods?
You don't usually need to avoid normal foods, but avoid potassium supplements and salt substitutes, and have blood tests as advised.
Is spironolactone a water tablet?
Yes, a mild one that keeps potassium in the body, unlike furosemide which tends to lower it.
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.