In short: spironolactone is an older blood-pressure and fluid tablet that also blocks androgen hormones. Dermatologists prescribe it off-label for female pattern hair loss and PCOS-related thinning, often alongside minoxidil. Many women stabilise or improve over 6–12 months. It's prescription-only, needs reliable contraception, and isn't used for men's hair loss.
Prescription medicine, off-label use. → Disclaimer
How it works
Spironolactone reduces the effect of androgens (male-type hormones) on hair follicles. It blocks androgen receptors and lowers androgen production. Less androgen effect means less follicle shrinking on the top of the head.
Who it's for
- Women with female pattern hair loss, especially with signs of high androgens (acne, facial hair, irregular periods)
- Women with PCOS
- Often combined with minoxidil (topical or oral)
Not for:
- Pregnancy or trying to conceive. It can affect the development of a male baby, so effective contraception is needed.
- Kidney disease, high potassium, Addison's disease
- Men (it has feminising effects)
- Use with caution alongside potassium supplements, some blood-pressure medicines (ACE inhibitors, ARBs) or NSAIDs, because potassium can rise.
Typical doses
Usually started low and increased: commonly 25–50 mg a day, up to 100–200 mg a day. Your doctor decides.
Does it work?
Evidence comes mostly from observational studies and small trials. They suggest many women's hair stops getting worse or improves, especially when spironolactone is combined with minoxidil. It's widely used by dermatologists, but large randomised trials are lacking.
Timeline: expect 6–12 months before judging. Take monthly photos of your parting. → How to track results
Side effects
| Side effect | Notes |
|---|---|
| Irregular periods or spotting | Common; often settles; sometimes managed with the pill |
| Breast tenderness | Common, usually mild |
| Passing more urine, thirst | It's a mild diuretic |
| Dizziness, low blood pressure | Stand up slowly; tell your doctor |
| High potassium | Uncommon in healthy young women; your doctor may check blood tests, especially with risk factors |
| Tiredness, headache | Uncommon |
Spironolactone vs other options
| Spironolactone | Finasteride (women) | Contraceptive pill (anti-androgen type) | |
|---|---|---|---|
| Use in women's hair loss | Common, off-label | Specialist only | Via gynaecologist |
| Contraception needed | Yes | Yes (strictly) | It is contraception |
| Evidence | Moderate | Limited | Moderate |
FAQs
Does spironolactone cause hair loss? Not usually. Some women notice temporary shedding when starting any hair treatment. Report heavy or persistent shedding.
Can I take it while breastfeeding? Discuss with your doctor.
Will I need it forever? Like other pattern hair loss treatments, benefits usually last only while you take it.
See a doctor soon if you have: round bald patches that appear suddenly · hair coming out in clumps · redness, pain, pus, scaling or scarring on the scalp · hair loss with fever, weight loss, irregular periods, acne or new facial hair · eyebrow or eyelash loss · hair loss in a child.
Sources
- Sinclair R, et al. Treatment of female pattern hair loss with oral antiandrogens. Br J Dermatol. 2005;152:466–73.
Medical review pending: not yet reviewed by a dermatologist. Medical disclaimer
Discussion
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