Spironolactone is a water pill that also blocks the effects of testosterone. Doctors prescribe it for PCOS, now officially renamed PMOS, mainly for acne, extra facial or body hair, and thinning scalp hair. The most common spironolactone side effects in women are needing to urinate more, feeling dizzy when standing up, breast tenderness and irregular periods or spotting. It must not be taken during pregnancy, so reliable contraception is essential. Results take time: about three months for acne, and six months or more for hair growth.
What spironolactone does in PCOS
In PCOS, higher androgen (male hormone) levels drive acne on the chin and jawline, extra hair growth and hair thinning on the scalp. Spironolactone blocks androgens from acting on the skin and hair follicles, and lowers how much the body makes. It treats these skin and hair signs. It does not make you ovulate or fix the cause of irregular cycles. That’s why doctors often combine it with a birth control pill, or with metformin when insulin resistance is part of the picture.
Common side effects
- urinating more often, and feeling thirsty
- dizziness or light-headedness, especially when standing up quickly
- breast tenderness or breast enlargement
- irregular periods or spotting between periods
- tiredness or headache
Many of these ease after the first few weeks, or with a dose change.
Why spironolactone can make periods irregular
Irregular bleeding is one of the most common reasons women stop spironolactone. It can cause spotting between periods, or periods that come more often, especially at higher doses. It usually isn’t dangerous, but tell your doctor. Common fixes are a lower dose or adding a birth control pill, which also provides the contraception spironolactone requires; in a large study of women taking it for acne, menstrual side effects were less common in those also using the pill. If bleeding is heavy or lasts longer than seven days, see your doctor promptly. Our guides to periods that come early and periods that come late explain the other causes to rule out.
The pregnancy warning
Spironolactone can affect the development of a male baby. Use reliable contraception while you take it, and stop it before trying to conceive, with your doctor’s guidance. If you think you could be pregnant, stop taking it and contact your doctor right away. If you’re breastfeeding, ask your doctor before starting.
Potassium and medicine checks
Spironolactone keeps potassium in the body. In healthy young women this is rarely a problem, but your doctor may check your potassium, especially if you have kidney problems or take blood pressure medicines such as ACE inhibitors. Avoid potassium supplements and salt substitutes unless your doctor says they’re fine.
Get urgent care for muscle weakness, an irregular or very slow heartbeat, or fainting. These can be signs of high potassium.
How to make spironolactone easier to take
- Take it in the morning, so extra trips to the bathroom don’t disturb your sleep.
- Drink normally and stand up slowly if you feel light-headed.
- Give it time. Judge acne at about three months and hair growth at six months or more.
- Keep your skin routine. Topical acne treatments still help alongside it.
- Don’t stop or change the dose on your own. Your doctor can adjust it.
An external routine alongside your care
If you’d like a routine that involves nothing swallowed, CycleBalance is one option to add to your plan for cycle timing. It is a sealed herbal pouch worn over the navel, held by a reusable belt and replaced every five days. It does not treat acne, hair growth or PCOS, and it does not replace spironolactone or the contraception it requires.
In Dr. Wang’s practice records from 2016 to 2022, seven women with irregular cycles used the CycleBalance formula. One woman in her early 30s, whose cycles had run 39 to 42 days, reported a 35-day cycle after her course. These were selected, uncontrolled cases, so they cannot show what caused the change or predict your result. Review the ingredient list with your doctor or pharmacist.
See CycleBalance’s directions →
Reviewed October 2026. Author: Qingcai Wang, MD, PhD, developer of the Five Essences external herbal-pouch formulations, with a commercial interest in their sale. General education only; continue your medical care.
Sources: MedlinePlus: spironolactone; Garg et al., long-term spironolactone for acne in women, J Am Acad Dermatol (2021); 2023 International PCOS (PMOS) Guideline.
The routine behind this article
CycleBalance is the Five Essences external herbal pouch matched to this topic — worn on the body, nothing swallowed. One course is six pouches (about 30 days), with a fresh pouch every five days. $199 per course; the reusable belt is $15 if you don’t have one. Every first course is covered by the 90-Day First-Course Satisfaction Guarantee.
Wellness support, not medical care.
This article is part of our Women’s Core Health guide — cycle, fertility and postpartum, in one place.