Spironolactone (Aldactone) for Hormonal Acne in Women: An Option When Isotretinoin Isn't Suitable — Siam Derm IOD

Spironolactone (brand name Aldactone) is a potassium-sparing diuretic with anti-androgen (male hormone-blocking) activity, so it is widely used to treat hormonal acne in women, especially acne on the chin, jawline and neck, acne that flares before periods, acne from PCOS, or acne that starts in adulthood. In this article, a dermatologist explains the mechanism, who it suits, dosing, safety monitoring and precautions, so you can understand why Spironolactone is an important option when Isotretinoin is not suitable.

How does Spironolactone treat hormonal acne?

Spironolactone reduces the activity of male hormones that stimulate the oil glands through two main mechanisms: it reduces the binding of androgen to its receptor (androgen receptor) and it inhibits the enzyme 5-alpha reductase. The result is less oil (sebum) production in the skin, which improves hormonal-pattern acne on the chin, jawline and neck. It suits acne in PCOS, acne that starts in adulthood, and acne that flares before periods.

Who is Spironolactone suitable for?

• Adult hormonal acne: Women aged 25 and over with hormonal-pattern acne (on the chin, jawline and neck, and flaring before periods).

• PCOS: Acne associated with polycystic ovary syndrome.

• Alternative to Isotretinoin: People for whom Isotretinoin has not worked or cannot be used, for example those planning to have children in the future, with high blood lipids, liver problems, or who cannot tolerate its side effects.

• Resistant acne: Acne that has not responded to topical treatments and oral antibiotics.

Contraindications: Spironolactone must not be used in pregnancy (classified as Category C, with a risk of incomplete male sexual development in a male fetus, or feminization), in people with high blood potassium (hyperkalemia), or in those with severe kidney impairment.

Dosage and how it is used

• Starting dose: 25-50 mg/day for 1-2 months, then increased to 100 mg/day if there is no improvement after 2-3 months.

• Maximum dose: Not more than 200 mg/day (according to some studies).

• Time to work: Improvement begins at 2-3 months, with the clearest results at about 6 months.

• Use with birth control pills: Combining it with oral contraceptives (such as Yaz or Diane-35) improves effectiveness and provides contraception at the same time.

• Maintenance dose: 50-100 mg/day continuously for 1-2 years.

Safety monitoring and side effects

• Before starting: Check potassium (K+), creatinine and blood pressure, and do a pregnancy test.

• During treatment: Repeat K+ and creatinine at 1 and 3 months after starting or changing the dose. In patients under 45 with no kidney or heart disease, some guidelines say routine K+ testing may not be necessary.

• Common side effects: Irregular periods (which can be managed by adding birth control pills), breast tenderness, frequent urination and dizziness.

• Side effects to watch for: High blood potassium, seen in fewer than 1% of healthy people.

Frequently asked questions

How long does it take to work? Acne generally starts to improve at 2-3 months, with the clearest results at about 6 months, so it needs to be taken consistently and patiently.

Can men use it for acne? It is not recommended at the doses used to treat acne in men, because its anti-androgen effect may cause breast enlargement (gynecomastia) and changes in sexual characteristics.

Will acne come back after stopping? Acne often returns after stopping, so a maintenance dose is usually continued, or switching to Isotretinoin may be considered as appropriate.

Must it always be used with birth control pills? Combining it with birth control pills improves effectiveness and provides contraception at the same time, which is very important because pregnancy must be avoided while taking this medicine. However, the decision depends on an individual assessment by your doctor.

Hormonal acne in women is treatable, and Spironolactone is a safe and effective option under a doctor's care. If you have persistent acne on the chin, jawline or neck that does not respond to usual treatments, or you cannot use Isotretinoin, consult a dermatologist at Siam Dermatology. Call +66 61 448 7000 or LINE @siamderm.

Written by Dr. Patara Voravutinon, Dermatologist · Last reviewed July 16, 2026