Spironolactone 25mg Tablet is a prescription potassium-sparing diuretic and aldosterone antagonist used for conditions including heart failure, edema, hypertension and hyperaldosteronism. Because spironolactone also has antiandrogenic activity, it is commonly prescribed in selected patients for hormonal acne and may be used as an antiandrogen in feminizing hormone therapy (HRT) under appropriate medical supervision.
Aldactone® is a reference brand of spironolactone. Generic spironolactone 25mg contains the same active pharmaceutical ingredient, although manufacturer, formulation, packaging and regulatory status can vary by market.
Spironolactone is a mineralocorticoid receptor antagonist with potassium-sparing diuretic and antiandrogenic properties.
It blocks the effects of aldosterone, a hormone involved in sodium and water retention and potassium excretion. This helps the kidneys eliminate excess sodium and water while reducing potassium loss.
Spironolactone also reduces androgen activity. This additional pharmacological effect is why it is prescribed in selected patients for hormonal acne and as an antiandrogen in some feminizing HRT regimens.
Spironolactone 25mg may be prescribed for:
Approved indications vary between countries, and some dermatological or hormone-related uses may be off-label depending on the jurisdiction.
Spironolactone has two commercially important pharmacological actions.
Spironolactone blocks aldosterone receptors in the kidneys, increasing sodium and water excretion while conserving potassium.
Spironolactone also reduces androgen-mediated effects. This can decrease androgen stimulation of sebaceous glands and hair follicles and is one reason it is used for hormonal acne and androgen suppression in selected HRT regimens.
Spironolactone is widely prescribed for hormonal acne, particularly in women whose acne is associated with androgen activity.
Its antiandrogenic effects may reduce androgen stimulation of sebaceous glands, potentially decreasing excess sebum production and helping control acne breakouts.
Spironolactone may be considered when conventional topical or oral acne treatments are inadequate or when hormonal factors are suspected.
Treatment should be individualized because spironolactone can affect blood pressure, potassium levels, kidney function and menstrual patterns.
Hormonal acne commonly affects the lower face, jawline and chin and may fluctuate with hormonal changes.
Spironolactone does not function as a conventional antibiotic or topical acne medicine. Instead, its antiandrogenic activity can reduce the hormonal stimulation contributing to acne.
The appropriate dose varies considerably between patients. A 25mg tablet may be used as part of an individualized regimen, but patients should not change the dose without medical advice.
Spironolactone can be prescribed as an antiandrogen in feminizing hormone therapy (HRT).
Its role is to reduce androgen activity rather than provide estrogen. It may therefore be prescribed alongside estrogen as part of an individualized feminizing HRT regimen.
Medical monitoring may include:
The use of spironolactone in HRT and the preferred treatment approach can vary by country and clinical guideline.
Spironolactone has antiandrogenic properties that can reduce the effects of testosterone and other androgens.
For this reason, it may be prescribed for:
The indication and dose should be determined by a qualified healthcare professional.
Spironolactone is an established aldosterone antagonist used in appropriate patients with heart failure.
By blocking aldosterone, it can help reduce sodium and fluid retention while providing cardiovascular benefits in selected patients.
Kidney function and serum potassium are particularly important when spironolactone is prescribed for heart failure.
Spironolactone can be prescribed to manage edema and fluid retention associated with certain cardiovascular, hepatic or renal conditions.
It increases urinary sodium and water excretion while limiting potassium loss.
The underlying cause of edema should always be assessed before treatment.
Spironolactone can lower blood pressure and may be prescribed for hypertension, particularly when aldosterone excess contributes to elevated blood pressure or when additional therapy is required.
It may also be used in selected patients with resistant hypertension under medical supervision.
Spironolactone is commonly used for primary hyperaldosteronism.
By blocking aldosterone receptors, it counteracts excessive aldosterone activity, helping reduce sodium retention and potassium loss.
Patients with hyperaldosteronism may require doses different from the 25mg tablet strength depending on their clinical condition.
Aldactone® is a reference brand containing spironolactone.
Generic spironolactone 25mg products contain the same active pharmaceutical ingredient. However, inactive ingredients, manufacturer, packaging and regulatory authorization may differ.
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The appropriate dosage depends on the indication, patient characteristics, kidney function, serum potassium, response to treatment and other medicines.
The 25mg tablet may be used as a starting dose, maintenance dose or part of a customized treatment schedule.
For acne and HRT, dosing should be determined by the treating healthcare professional. The dose used for cardiovascular or renal conditions may differ significantly from the dose used for antiandrogen therapy.
Do not increase, reduce or discontinue spironolactone without medical advice.
Possible adverse effects include:
Because of its antiandrogenic activity, spironolactone can also cause gynecomastia in some men.
Serious hyperkalemia can occur, particularly in patients with kidney impairment or those taking other medicines that increase potassium.
Healthcare professionals may monitor:
Monitoring is particularly important after treatment initiation or dose changes and in patients taking other medicines that can increase potassium.
Spironolactone is a potassium-sparing medicine.
Unlike some other diuretics that lower potassium, spironolactone can increase potassium levels. The risk is higher in people with impaired kidney function and those taking ACE inhibitors, ARBs, potassium supplements or other potassium-raising medicines.
Do not use potassium supplements or potassium-containing salt substitutes unless specifically recommended by a healthcare professional.
Potentially important interactions include:
Patients should disclose all prescription medicines, over-the-counter medicines, vitamins and supplements before starting spironolactone.
Spironolactone 25mg Tablet is a prescription medicine supplied through appropriately licensed pharmacies and pharmaceutical suppliers.
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Availability, prescription requirements, approved indications and import regulations vary across the USA, UK, UAE/Dubai, Australia, Singapore, Thailand, China and Russia.
Spironolactone 25mg may be prescribed for heart failure, edema, hypertension, hyperaldosteronism and hormonal acne. It may also be used as an antiandrogen in selected feminizing HRT regimens.
The generic name is spironolactone.
Aldactone is a reference brand containing spironolactone. An appropriately authorized generic spironolactone product contains the same active pharmaceutical ingredient.
Yes. Spironolactone is commonly prescribed for hormonal acne because of its antiandrogenic activity. Its use for acne may be off-label depending on the country.
Yes. By reducing androgen activity, spironolactone can help reduce androgen-related oil production and acne in selected patients.
Yes. Spironolactone may be used as an antiandrogen in feminizing hormone therapy. It is generally used to reduce androgen effects rather than as a replacement for estrogen.
Spironolactone is not an estrogen. In HRT, it functions primarily as an antiandrogen/androgen blocker and may be combined with estrogen when clinically appropriate.
Yes. It can be prescribed as part of some feminizing HRT regimens to reduce androgen activity. Treatment should be individualized and medically monitored.
Yes. It is a potassium-sparing diuretic and aldosterone antagonist.
Yes. Spironolactone can lower blood pressure and may be prescribed for hypertension.
Yes. Spironolactone can increase serum potassium and may cause hyperkalemia, particularly in patients with kidney problems or those taking other potassium-raising medicines.
Healthcare professionals commonly monitor serum potassium and kidney function, especially after starting treatment or changing the dose.
Spironolactone is a prescription medicine. It should be obtained through an appropriately licensed pharmacy or authorized pharmaceutical supplier and used according to medical advice.
Spironolactone products are marketed in many countries, but brand names, approved indications, prescription requirements and formulations vary between markets.
Medical Disclaimer: This product information is provided for educational and informational purposes only and is not a substitute for professional medical advice, diagnosis or treatment. Spironolactone is a prescription medicine that can increase serum potassium and affect kidney function and may interact with numerous medicines. Its use for acne and feminizing HRT should be individually assessed by a qualified healthcare professional. The appropriate indication, dose, monitoring and treatment duration depend on the patient’s clinical circumstances. Always consult a healthcare professional before starting, stopping or changing spironolactone treatment.
Last Updated: August 23, 2026
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Spironolactone 25mg Tablet
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