Spironolactone Dosage for Acne in Women: What Studies Report

By Nicki Wilson in Spironolactone · Published June 26, 2026 · Updated October 16, 2026

Quick answer: The sources we checked describe acne doses of 25 mg and 50 mg and 100 mg a day, and they do not all use the same start. One series analyzed 70 women treated with 150 mg a day or less. In the BMJ SAFA trial, the spironolactone group took 50 mg a day, then 100 mg a day from week six. A 2025 practice review in Cutis recommends starting at 100 mg a day. The American Academy of Dermatology (AAD) says the dose goes up gradually, with dermatology visits every 4 to 6 weeks at the start. Your own prescriber sets your dose.

This page is about women only. The AAD says spironolactone is not prescribed to treat acne in men because of side effects, so nothing here applies to men. Spironolactone is also off-label for acne, which means acne is not an indication on the Aldactone label. Dose numbers below come from published studies and a practice review. The label gives no dose for acne. A study dose is not a prescription.

What dose of spironolactone is used for acne?

The Aldactone label lists heart failure, hypertension as add-on therapy, edema and primary hyperaldosteronism as its indications, and acne is not among them. The label does list tablets in 25 mg, 50 mg and 100 mg strengths. A 2025 meta-analysis describes spironolactone as used off-label for acne by lowering sebum production. So acne doses come from dermatology studies and practice reviews rather than the label.

SAFA is one randomized trial in these sources. In that BMJ trial, 410 women aged 18 or older with facial acne were randomly assigned to spironolactone or a placebo. The spironolactone group took 50 mg a day until week six, then 100 mg a day until week 24. The trial concluded that spironolactone improved outcomes compared with placebo, with greater differences at week 24 than week 12.

A 2025 review in Cutis takes a firmer line on where to start. Its authors recommend a starting dose of 100 mg a day, as most patients can tolerate it and it has superior effectiveness to lower doses. A Mayo Clinic series of 395 patients reports a median dose of 100 mg daily and a median treatment duration of 13 months. The authors describe few adverse effects.

These sources do not agree on one starting number, and none of them is a rule for you. Kidney function and other medicines appear in the label’s potassium warning, so a prescriber needs your full history. The TGIC FAQ says a board-certified dermatologist evaluates whether spironolactone is appropriate for your case during intake. The how it works page says you can message your dermatologist through your dashboard about dosage concerns.

Does 25 mg of spironolactone work for acne?

A 2020 randomized trial from Thailand tested low doses. Sixty-three women aged 25 to 45 with moderate acne used daily benzoyl peroxide 2.5% plus 25 mg of spironolactone, 50 mg of spironolactone or a placebo for 12 weeks. Total acne counts fell in all three groups. The abstract reports that the 50 mg group had a significantly higher success rate than the placebo group, and it does not report that result for the 25 mg group.

That is one small trial, and it tested 25 mg alongside a topical medicine rather than alone. The trial authors proposed low-dose spironolactone plus benzoyl peroxide as an option for moderate adult female acne in Thai women. It does not show what 25 mg would do for you, so ask your prescriber why a given dose was chosen.

Is 150 mg of spironolactone used for acne?

The sources do not show a study that assigned 150 mg as the dose. A retrospective review of 70 women analyzed low-dose spironolactone of 150 mg a day or less. The Thai trial’s authors write that 100 to 200 mg a day is used off-label for adult female acne. They add that high doses cause clinically significant side effects that prevent widespread use.

The sources we checked do not say when a prescriber should move to 150 mg or what blood tests that step needs. The label says to monitor serum potassium within 1 week of initiation or titration and regularly after that, and it does not say when to move to 150 mg for acne. If a higher dose is suggested, ask what you should watch for and when labs happen.

How does the dose change over time?

The AAD says spironolactone requires that you gradually increase the dose, so you will need to see your dermatologist every 4 to 6 weeks when you start taking it. MedlinePlus says a doctor may start you on a low dose and gradually increase it. SAFA built one step into its design, and that step came at week six.

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The AAD also says studies show that taking spironolactone at the same time every day can improve results. MedlinePlus adds that you should take it exactly as directed and not take more or less of it. Our guide on how long spironolactone takes to work for acne covers the timeline of improvement, so this page leaves it there.

What if you miss a dose?

MedlinePlus says to take the missed dose as soon as you remember it. If it is almost time for your next dose, skip the missed dose and continue your regular schedule. Do not take a double dose to make up for a missed one.

Do higher doses need blood tests?

The AAD says that before your dermatologist prescribes spironolactone, you will need some blood tests. It also warns that too much potassium can be dangerous, so skip coconut water and supplements that contain potassium. The Aldactone label says it can cause hyperkalemia. The risk is increased by impaired renal function, potassium supplements, potassium-containing salt substitutes, and drugs such as ACE inhibitors and angiotensin receptor blockers.

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The label also says to monitor serum potassium within 1 week of initiation or titration and regularly thereafter. The label does not list acne as an indication. For acne, a 2015 JAMA Dermatology study of 974 healthy young women found 13 abnormal potassium results in 1802 measurements and concluded that routine potassium monitoring is unnecessary for healthy women. Which advice fits you depends on your health, so your prescriber decides.

MedlinePlus lists products that may interact with spironolactone, including potassium supplements and NSAIDs such as ibuprofen and naproxen. It says to avoid potassium-containing salt substitutes. It also says to call your doctor immediately for muscle weakness, pain, or cramps, or for changes in heartbeat, or for confusion, or for fainting, or for decreased urination. Our spironolactone side effects guide covers the full list.

What should you know about pregnancy and birth control at any dose?

The AAD says it is essential to use birth control while taking spironolactone. If you can get pregnant, you will need it, and the AAD warns that a baby can have serious birth defects if you get pregnant while taking it. The Aldactone label points to a potential risk to the male fetus. It says to avoid spironolactone in pregnant women or advise a pregnant woman of that risk.

MedlinePlus says to tell your doctor if you are pregnant, plan to become pregnant or are breastfeeding, and to call your doctor if you become pregnant while taking it. The label also says safety and effectiveness have not been established in pediatric patients. SAFA enrolled women aged 18 or older. Our article on spironolactone and birth control explains how the two are paired.

Does the pill change how spironolactone is used?

The AAD says taking both spironolactone and the pill can increase effectiveness. Without the pill, the most common side effects are painful periods, irregular periods, breast tenderness and breast enlargement. The AAD says these may be decreased when women also take the pill. The Cutis review adds that menstrual irregularities tend to be dose dependent and can be prevented or treated using combined oral contraceptives.

The AAD also says that if you are 35 or older, the pill may not be an option and only spironolactone may be prescribed. The AAD also says taking spironolactone without the pill is recommended when a medical condition makes the pill unsafe, such as having had a blood clot or stroke.

When is a higher dose not the next step?

The 2024 AAD acne guideline makes conditional recommendations for spironolactone and for combined oral contraceptive pills, among its conditional options. It makes strong recommendations for benzoyl peroxide, topical retinoids, topical antibiotics and oral doxycycline. Spironolactone is one tool among several, and a higher dose is not the only next step.

Our acne treatment comparison sets the main options side by side. The AAD says that when other acne treatments do not work, spironolactone can effectively treat deep-seated, tender acne on the lower face, jawline or neck. It also says that taking hormonal therapy long term appears to be safe.

Common questions about spironolactone dosage for acne

What is the usual spironolactone dosage for acne? There is no single labeled acne dose, because acne is not listed as an indication on the Aldactone label. SAFA used 50 mg a day and then 100 mg a day, and a Cutis review recommends starting at 100 mg a day. Your prescriber sets the dose for you.

Does 25 mg of spironolactone work for acne? A small Thai trial tested 25 mg and 50 mg with benzoyl peroxide for 12 weeks. Its abstract reports a significantly higher success rate than placebo for the 50 mg group and does not report that result for 25 mg. Ask your prescriber about the reason for your dose.

Is 150 mg of spironolactone too much for acne? The sources we checked do not call 150 mg too much or give a rule for it. A retrospective review analyzed doses of 150 mg a day or less, and the Thai trial’s authors say high doses cause clinically significant side effects that prevent widespread use. Your prescriber decides, and you can ask about labs.

What if I miss a dose of spironolactone? MedlinePlus says to take it as soon as you remember. If it is almost time for your next dose, skip the missed one, and do not take a double dose to make up for a missed one.

Can men take spironolactone for acne? The AAD says spironolactone is not prescribed to treat acne in men due to side effects, and that men have developed breasts while taking it. This page is about women only.

Where can you talk to a dermatologist about your dose?

The TGIC FAQ says spironolactone is part of its treatment library for hormonal acne in adult patients who can use it. A board-certified dermatologist evaluates whether spironolactone is appropriate for your case during intake, factoring in history, other medications and lab needs. If you’d like that review, take the quiz and upload a front photo and a side photo. The how it works page says the quiz takes about two minutes. Medication is billed separately by the pharmacy, as low as $0 for the prescription with insurance. See the Accutane cost FAQ for how that page describes coverage.

This article is general information, not medical advice. A prescription is never guaranteed, and treatment decisions stay with the board-certified dermatologist who reviews your case. Spironolactone is used off-label for acne. Aldactone® is a registered trademark of its respective owner. The Goal Is Clear is operated by BNG Health Services, LLC, which is not the prescribing physician; board-certified dermatologists prescribe.

Sources

General information from published sources, not medical advice. Your dermatologist makes every treatment decision after reviewing your case. The Goal Is Clear is operated by BNG Health Services, LLC, which is not the prescribing physician.

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