Post-finasteride syndrome is the name used for sexual, mental and physical symptoms that some men report continue after they stop finasteride. The Propecia label lists sexual problems that continued after stopping, and depression and suicidal thoughts, among reports collected after approval. How often this happens, why, and whether it is one condition are still argued about in the medical literature.
This page sets out what the label and the studies say, what is not known, and what a useful record looks like if you are worried. It is not a reason to start or stop a medicine on your own.
TL;DR
- The Propecia label lists sexual dysfunction that continued after stopping, plus depression and suicidal ideation, among reports after approval.
- Those reports cannot give a frequency or prove that the drug caused them.
- In one follow-up of 54 men whose sexual symptoms had lasted at least three months after stopping, 96 percent still had them about a year later.
- A 2025 review calls the syndrome contested: its mechanism, its frequency and even its definition are unsettled.
- If you have thoughts of harming yourself, seek help now. For everything else, a dated symptom log helps your doctor most.
Important
This article is educational and not medical advice. If you are worried about sudden shedding, scalp symptoms, or side effects, talk to a licensed clinician.
What the label says
The current Propecia prescribing information lists, among reactions identified after approval, “sexual dysfunction that continued after discontinuation of treatment, including erectile dysfunction, libido disorders, ejaculation disorders, and orgasm disorders,” and under psychiatric reactions, “depression, suicidal ideation and behavior.” The label explains that such reports come from a population of uncertain size, so their frequency and their link to the drug cannot be reliably established (Propecia label on DailyMed).
The US Food and Drug Administration added suicidal ideation to the finasteride label after patient reports. A review written for urologists says that most of the evidence points to more depressive symptoms in users of this drug class, but that without good randomised studies, a causal link to suicidal thoughts remains unclear (Al Saffar and colleagues, 2023).
What the studies found
Much of the early research comes from one researcher, Michael Irwig, who followed men who had used finasteride for hair loss and reported sexual side effects that continued after stopping. In one study, 54 such men, all healthy before finasteride, were reassessed about 14 months later. Persistent sexual side effects were still present in 96 percent, and how long they had used the drug did not predict the outcome (Irwig, 2012). This tells you what happened to men who already had lasting symptoms. It does not tell you how many users develop them in the first place.
A 2025 review asked directly whether post-finasteride syndrome is a true clinical entity. It describes reported sexual, neuropsychiatric and physical symptoms, discusses possible mechanisms in the nervous system and genetics, and notes that its existence and recognition are still disputed. The authors call for better research and for patients to be told about the risk before they start (Cilio and colleagues, 2025).
What is not known
- How many finasteride users develop symptoms that last after stopping. No study has measured that rate well.
- Why it would happen. Changes in the nervous system and genetic factors have been proposed, but none is proven.
- Who is at risk. No test can predict it before treatment.
- How it is best treated. The reviews above describe no established treatment for it.
If you are worried right now
If you have thoughts of suicide or of harming yourself, contact emergency services or a crisis line in your country today. That comes before any tracking. For mood changes during treatment, see the finasteride mood and brain fog checklist.
What to record for your doctor
Symptoms like these are hard to describe months later. A short, dated log gives your doctor something concrete to work with, whether you are still taking finasteride, thinking about stopping, or have already stopped.
- Dates: when you started, any change your prescriber made, and the day you stopped.
- Before and after: how your sex life, mood, sleep and focus were before treatment, in your own words, written down now while you remember.
- A weekly line: sexual function, mood and energy, each scored the same simple way every week.
- Other changes: new medicines, alcohol, stress, illness or relationship changes that could affect the same things.
- Who you told: the dates you raised it with a doctor and what was checked.
Keep your hair photos in the same log, so a decision about treatment weighs both sides. See tracking shedding after stopping finasteride.
Talking to a doctor
Raise symptoms with the prescriber who started finasteride, and ask whether a referral to a urologist, an endocrinologist or a mental health professional makes sense. Bring your log. The label and the reviews above all point the same way: these reports are taken seriously, and they are easier to assess with dates than with memory.
Next step
Write down your start and stop dates today, then one line on sexual function, mood and energy. Repeat that line weekly and bring it to your next appointment.
Related reading
- Finasteride mood and brain fog tracking
- Finasteride drug interactions checklist
- Finasteride and fertility
Sources: Propecia prescribing information, DailyMed; Irwig 2012, Journal of Sexual Medicine; Cilio et al. 2025, International Journal of Impotence Research; Al Saffar et al. 2023, European Urology Open Science.
