Hirsutism · Medical Options
Spironolactone for hirsutism: how it works and what to expect
Spironolactone is the anti-androgen most often prescribed off-label for hirsutism and PCOS-related facial hair. It genuinely works for many women, but it is slow, it requires monitoring, and it is not safe in pregnancy. This is a plain-language explainer to help you have a better conversation with your clinician — not medical advice.
Important
Spironolactone is a prescription medicine. Doses, monitoring, and suitability must be decided by a clinician who knows your history. Nothing here replaces that conversation.
What it is and how it works
Spironolactone was developed as a potassium-sparing diuretic for blood pressure and heart failure. It also blocks androgen receptors and reduces androgen production, which is why dermatologists and endocrinologists use it for acne and hirsutism. By blunting the androgen signal reaching the follicle, it slows the conversion of fine vellus hair into coarse terminal hair.
Critically, it acts on future growth. It does not remove coarse hairs already present — those still need removing, and the removal methods guide covers the options.
Typical timeline
| Stage | What usually happens |
|---|---|
| Weeks 0–4 | Started at a low dose, often increased gradually. Blood pressure and potassium may be checked. |
| Months 1–3 | Little visible change in hair. Acne and oiliness often improve first. |
| Months 3–6 | Regrowth commonly becomes slower and finer; removal intervals lengthen. |
| Months 6–12 | Assessment point. Guidelines advise judging anti-androgen response at six months or later. |
Hair biology sets that pace: a facial follicle's growth cycle runs for months, so nothing acting on new growth shows results in weeks. The same is true of topical inhibitors — see how long inhibitors take to work.
Side effects and monitoring
- Increased urination, especially early on.
- Menstrual irregularity or spotting — one reason it is often prescribed alongside a combined pill.
- Breast tenderness.
- Dizziness or low blood pressure.
- Raised potassium, which is why clinicians may check bloods, particularly with kidney issues or other potassium-raising medicines.
Spironolactone must not be used in pregnancy because of the risk of feminising a male fetus, so effective contraception is standard practice. If you are pregnant, trying to conceive, or breastfeeding, see what is and is not appropriate in pregnancy and speak to your clinician.
How it compares with other options
Combined oral contraceptives lower free androgens and are often used with spironolactone rather than instead of it — see birth control for hirsutism. Topical eflornithine slows an enzyme in the follicle and acts locally, covered in eflornithine compared. Laser and electrolysis remove existing follicles. Full comparison: medical vs natural hirsutism treatment.
Where a topical inhibitor fits
Many women want something to use while they decide about, wait for, or come off systemic medication — or alongside it. A topical inhibitor is applied to the skin, does not act systemically, and targets the follicles you are treating. Mohammed's 2014 comparative study found topical Cyperus rotundus oil reduced hair growth in idiopathic facial hirsutism, and a 2022 trial found reduced pigmentation after hair removal. Cyperus rotundus oil is not a substitute for medical treatment of an underlying hormonal condition, but it does address regrowth locally. Tell your clinician what you are using.
Frequently asked questions
How long does spironolactone take to work for facial hair?
Most clinical guidance recommends assessing response at six months or later. Acne and oiliness often improve within weeks, but changes in hair growth follow the follicle cycle and take months.
What dose of spironolactone is used for hirsutism?
Doses vary and are individualised. Clinicians typically start low and titrate upward based on response and tolerance, with monitoring of blood pressure and potassium. Your prescriber decides the dose.
Do I need contraception while taking spironolactone?
Yes. Spironolactone can harm a developing male fetus, so effective contraception is standard. Combined oral contraceptives are frequently prescribed alongside it and also help with hirsutism.
Will the hair come back if I stop spironolactone?
Usually. It suppresses the androgen signal rather than removing follicles, so growth tends to return over the months after stopping unless the underlying cause has changed.
Can I use a topical inhibitor with spironolactone?
Many people do, because they work at different levels — one systemically, one at the follicle. Tell your prescriber what you are applying so they have the full picture.
Is spironolactone a hair removal treatment?
No. It affects what grows in future; it does nothing to hair already on your face. You still need a removal method, and pairing it with a low-irritation one keeps the skin calm.
Related reading
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Read article →Best Way to Get Rid of Chin Hair Permanently
Laser vs electrolysis vs at-home — what's truly permanent.
Read article →References
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