Spironolactone for female hair loss: how doctors use it

Female pattern hair loss is the most common type of hair loss in women. Topical minoxidil is the main approved treatment, but some women need or want more options ¹. One medicine doctors often consider is spironolactone, a tablet that has been used for decades for other conditions.

What is spironolactone?

Spironolactone was developed as a diuretic (a "water tablet") and is used for conditions such as high blood pressure and heart failure. It also has anti-androgen effects, meaning it reduces the action of male-type hormones in the body. That is why dermatologists use it for acne, excess hair growth and female pattern hair loss.

For hair loss, spironolactone is usually prescribed off-label. This means it is being used for a purpose not listed on its original licence, which is common and legal when a doctor judges it appropriate.

Why anti-androgens may help some women

In men, androgens such as dihydrotestosterone (DHT) play a clear role in pattern hair loss. In women, their exact role is less clear ¹. Some women with pattern thinning have signs of higher androgen activity, such as acne, excess facial or body hair, or irregular periods (for example with polycystic ovary syndrome) ². Others have normal hormone levels. Anti-androgens may help in both groups, but the response varies.

What the studies show

A 2023 systematic review looked at seven studies of spironolactone for pattern hair loss, including 618 patients (553 women and 65 men), of whom 414 received spironolactone ³. Its findings:

• Oral doses ranged from 25 mg to 200 mg daily, with most between 80 mg and 110 mg.
• Topical forms included 1% gels and 5% solutions used twice daily.
• Both oral and topical spironolactone showed benefit.
• Topical use had significantly fewer side effects.
• Spironolactone worked better when combined with other treatments such as oral or topical minoxidil than on its own.
• The authors called for more high-quality randomised trials.

A 2025 clinical review in the Journal of the American Academy of Dermatology noted that oral anti-androgens show some effect in women, but with side effects and situations where they should not be used. It said the choice of anti-androgen depends on factors such as age, signs of high androgens and the need for contraception ¹.

How doctors typically use it

Details vary, but common practice includes:

• Confirming the diagnosis first, often with a scalp examination and sometimes blood tests for iron, thyroid and hormones (see your first hair loss consultation).
• Starting at a low dose and increasing gradually if tolerated.
• Combining with minoxidil in many cases (see combining hair loss treatments).
• Reviewing progress after several months. Hair changes are slow, and it may take 6 to 12 months to judge.
• Taking photos at the start and at reviews to compare.

Side effects

Possible side effects of oral spironolactone include:

• Irregular periods or spotting
• Breast tenderness
• Dizziness, especially when standing, because it can lower blood pressure
• Passing more urine
• Raised potassium levels in the blood, which matters more for people with kidney problems or those taking certain other medicines
• Tiredness or headache

Most side effects are mild, but tell your doctor about any that concern you.

Important safety checks

• Pregnancy. Spironolactone should not be taken during pregnancy because of possible effects on the development of a male baby. Women who could become pregnant are usually advised to use reliable contraception ¹.
• Kidney function and potassium. Your doctor may check blood tests, especially if you have kidney disease, are older, or take medicines that raise potassium.
• Other medicines. Tell your doctor about all medicines, including blood pressure tablets and potassium supplements.
• Breastfeeding. Ask your doctor for advice.
• Men are rarely given oral spironolactone for hair loss because of feminising side effects such as breast enlargement.

What results to expect

Spironolactone is not a quick fix. The aim is usually to slow thinning and, for some women, improve density. Results differ from person to person. Stopping treatment may allow thinning to continue, so it is a longer-term decision.

When to see a doctor sooner

See a doctor promptly if hair loss is sudden, patchy, accompanied by scalp pain, redness or scarring, or if you have new symptoms such as rapidly worsening acne, deepening voice or very irregular periods. These may need different tests. See when to see a dermatologist.

The bottom line

Spironolactone is a well-established medicine that doctors can use off-label for female pattern hair loss. Studies are encouraging, especially when combined with minoxidil, but more high-quality trials are needed. It requires a prescription, contraception for women who could become pregnant, and medical monitoring.

Frequently asked questions

Does spironolactone help female hair loss?

A 2023 review of seven studies with 618 patients found benefit with both oral and topical forms, especially combined with minoxidil ³.

What dose of spironolactone is used for hair loss?

Studies used 25-200 mg daily, mostly 80-110 mg ³. Your doctor decides the dose.

Can I take spironolactone if I want to get pregnant?

It should not be taken during pregnancy. Discuss family planning with your doctor before starting ¹.

How long does spironolactone take to work?

Hair changes are slow. Doctors often review after several months, and it may take 6-12 months to judge.

Educational content. Not medical advice.