Spironolactone for PCOS: Acne, Facial Hair, Hair Loss, and What to Expect

Spironolactone (“spiro”) is the most common prescription for PCOS skin and hair symptoms. It blocks androgens such as testosterone at the skin and hair follicle. Acne usually responds first, often within 6-12 weeks; facial and body hair typically take 6 months or more and grow back slower, finer, and lighter rather than vanishing; scalp thinning may improve over 6-12 months. In studies and prescribing guidance, people commonly start around 50 mg a day and many end up at 100 mg a day.

How spironolactone works

With PCOS, higher androgens, or follicles that are extra sensitive to them, drive oily skin, jawline acne, chin and belly hair, and thinning at the part or crown. Spironolactone sits in the androgen receptor so testosterone cannot act as strongly there, and it slightly lowers androgen production. It does not fix ovulation or insulin resistance, so it is usually one part of a plan rather than the whole plan.

Realistic timelines

Symptom	When people often notice change	What “working” looks like
Acne	6-12 weeks; full effect at 4-6 months	Fewer deep jawline and chin breakouts
Facial and body hair	6 months or more, often closer to a year	Slower, finer, lighter regrowth; less frequent removal
Scalp thinning	6-12 months	Less shedding, then some regrowth

What people commonly report (r/PCOS)

• Timelines: “Acne about 1.5-2 months and hirsutism 6-9 months on 100 mg.” “It took about 6 months to see any difference, closer to a year before I saw a lot of difference in the hirsutism.”
• Dose matters: a recurring theme is that 25 mg did not do much for hair; people who saw hair changes were mostly on higher doses after stepping up with their prescriber.
• It slows hair rather than erasing it: most people still pair it with laser or other hair removal.
• Common side effects people mention: peeing more, thirst or salt cravings, lightheadedness when standing quickly, breast tenderness, spotting or irregular bleeding (especially without birth control), and for some, lower libido or mood changes. Many say the first few weeks were the hardest.

A practical game plan to discuss with your prescriber

1. Baseline checks. Prescribers usually check kidney function and potassium if you have risk factors. Avoid potassium supplements and salt substitutes, which are often potassium chloride.
2. Plan contraception. Spironolactone is not safe in pregnancy, so reliable contraception is standard. Long-term data show a combined pill plus spironolactone works better for hirsutism than either alone, and the pill smooths out spotting.
3. Start low, step up. A common path in prescribing guidance is about 50 mg for a few weeks, then 100 mg. Many people take it in the morning to avoid night-time bathroom trips.
4. Give it a fair trial. Judge acne at about 3 months and hair at about 6 months before deciding it does not work.
5. Stack it thoughtfully:
   • Acne: a topical such as adapalene or benzoyl peroxide
   • Facial hair: laser or electrolysis for existing hair (see PCOS facial hair)
   • Scalp: minoxidil, the most-cited pairing in PCOS communities (see PCOS hair loss)
   • Root cause: managing insulin resistance with protein-forward meals, strength training, and steps, plus inositol or metformin if appropriate
6. Raise side effects early. Lightheadedness often improves with fluids, spotting often settles with a combined pill, and mood or libido changes are worth discussing because a different plan may suit you better.

Spironolactone vs other options

Option	What it targets	Notes
Combined birth control pill	Lowers androgen production; regulates bleeding	Often combined with spironolactone
Metformin or inositol	Insulin, which lowers androgens indirectly	Slower for skin and hair; helps the whole picture
Laser or electrolysis	Removes existing hair	Spironolactone slows regrowth
Eflornithine cream	Slows facial hair growth while used	Some use it alongside spironolactone

What to track while on spironolactone

• Skin: a weekly acne count or 1-5 rating, and where breakouts appear
• Hair: how often you shave or pluck, monthly part-line photos, and a shedding score
• Cycle: bleeding and spotting days, especially in the first 3 months
• Medications and habits: your start date and each dose change, plus water, protein, and workouts

At the 3- and 6-month marks, your PCOS Polly history shows whether it is working far more reliably than the mirror does.

Sources

• Mayo Clinic. PCOS: diagnosis and treatment.
• Long-term response of hirsutism to combination therapy in PCOS.
• NHS Scotland Right Decisions. Spironolactone for acne in women (primary care guidance).
• Teede HJ et al. 2023 International Evidence-based Guideline for the Assessment and Management of PCOS.
• Community experience: r/PCOS: Started spironolactone, how long until I see results?

This article is for general information and is not medical advice. Spironolactone is a prescription medication; dose, monitoring, and contraception should be decided with your prescriber.