Spironolactone for PCOS and Hormonal Acne: What to Know

What is spironolactone, and why is it used for PCOS and acne?

Spironolactone was originally developed as a diuretic and blood pressure medication — it blocks a hormone called aldosterone. But it also has a potent anti-androgen effect: it blocks androgen receptors and reduces the skin's response to testosterone and its more potent derivative, DHT.

Androgens drive several skin-related features of PCOS: - Acne — particularly on the lower face, jawline, and back; often appearing later in life or persisting beyond adolescence - Hirsutism — unwanted facial or body hair in a male-pattern distribution - Androgenetic alopecia — scalp hair thinning at the crown and temples

By reducing the androgenic signal at the hair follicle and oil gland level, spironolactone addresses the root hormonal driver — not just the surface symptom.

What does the evidence say about spironolactone for acne?

A 2025 systematic review and meta-analysis of randomized controlled trials found that spironolactone significantly reduced acne severity in adult women with moderate to severe acne, including hormonal patterns 1Ref 1Kow CS, Ramachandram DS, Hasan SS, Thiruchelvam K (2025).Spironolactone for the Treatment of Moderate to Severe Acne in Adult Women: A Systematic Review and Meta-Analysis of Randomised Controlled Trials.Spironolactone significantly reduces acne severity in adult women in RCT-level evidence. The American Academy of Dermatology's 2024 acne guidelines recognize spironolactone as an effective option for adult women with hormonal acne 2Ref 2Reynolds RV, Yeung H, Cheng CE, Cook-Bolden F, Desai SR, Druby K, Freeman EE, Keri JE, Stein Gold LF, Tan JKL, Tollefson MM, Weiss JS, Wu PA, Zaenglein AL, Han JM, Barbieri JS (2024).Guidelines of care for the management of acne vulgaris.AAD recognition of spironolactone as an effective option for adult women with hormonal acne.

It is notably effective for: - Acne that worsens premenstrually - Deep, cystic acne on the lower face and chin that does not respond well to standard antibiotics or topicals - Acne in adult women who have not had adequate response to other treatments

Spironolactone is used off-label for acne — meaning it is prescribed for this purpose even though it is FDA-approved for other indications (high blood pressure, heart failure, hormonal conditions). Off-label prescribing is common and evidence-based practice in dermatology and gynecology.

How does spironolactone help with PCOS symptoms beyond acne?

In women with PCOS, spironolactone addresses several androgen-driven features:

• Hirsutism (excess hair): Most women notice reduced new hair growth over 3 to 6 months; existing terminal hairs may not be removed — cosmetic hair removal is often used alongside
• Scalp hair thinning: Some improvement in androgen-related hair loss, though results vary
• Acne: As above

Spironolactone does not treat all aspects of PCOS. It does not address insulin resistance, irregular periods, or fertility — these require separate approaches. The 2023 international PCOS guideline recommends combined oral contraceptives as first-line for PCOS-related androgen symptoms, with spironolactone as an add-on or alternative 3Ref 3Teede HJ, Tay CT, Laven JJE, Dokras A, et al. (2023).Recommendations From the 2023 International Evidence-based Guideline for the Assessment and Management of Polycystic Ovary Syndrome.Combined oral contraceptives first-line for PCOS androgen symptoms; spironolactone as add-on or alternative. The 2013 Endocrine Society guideline similarly supports anti-androgen medications for hirsutism when hormonal contraception alone is insufficient 4Ref 4Legro RS, Arslanian SA, Ehrmann DA, Hoeger KM, Murad MH, Pasquali R, Welt CK (2013).Diagnosis and treatment of polycystic ovary syndrome: an Endocrine Society clinical practice guideline.Endocrine Society support for anti-androgen medications including spironolactone for hirsutism in PCOS.

What are the key side effects and considerations?

Common side effects: - Increased urination (particularly in the first few weeks, from the diuretic effect) - Breast tenderness - Irregular periods — often improved when combined with a hormonal contraceptive - Dizziness, particularly if you are on other blood pressure medications

Elevated potassium (hyperkalemia): Spironolactone can raise potassium levels. This is generally not a problem in healthy young women without kidney disease, but it is worth knowing about. Clinicians often check a basic metabolic panel (potassium level) periodically.

Pregnancy: Spironolactone is contraindicated during pregnancy — it has feminizing effects on a male fetus. Women of childbearing age are typically advised to use reliable contraception while on this medication. Many clinicians prescribe it alongside a combined oral contraceptive for both contraception and to help regulate the menstrual cycle.

Who prescribes it? Dermatologists and gynecologists are the specialists most likely to prescribe spironolactone for PCOS and acne. An endocrinologist may also manage it in the context of broader PCOS hormone management. A Gale clinician can evaluate your symptoms and refer you to the right specialist.