Finasteride: Mood Changes, Sexual Side Effects and Getting Help

What the latest UK warning means

In May 2026, the MHRA updated finasteride safety advice. The regulator strengthened information about psychiatric and sexual effects and retained the patient alert cards introduced in 2024. Sexual problems may contribute to changes in mood, but can also happen without mood symptoms.

Use the warning to decide what to discuss and when to seek help. It does not mean everyone will experience the effect, and it should not be dismissed because somebody else has taken the medicine without difficulty. Your experience and your health history matter to the discussion.

Read the leaflet supplied with your medicine and keep the alert card somewhere accessible. If the card is missing or the wording is unclear, ask the dispensing pharmacy. An old online review may not reflect the latest advice for the product in your hand.

When comparing information, check the medicine, strength and date. Advice about a prostate treatment, a different hair-loss medicine or a product used outside its licence may not answer your question about finasteride 1mg. Bring the conflicting information to your prescriber rather than trying to resolve it by counting reassuring and worrying comments.

Take a change in mood seriously

Before starting treatment, tell the prescriber about any history of depression or suicidal thoughts. During treatment, describe a change in how you feel even if you are unsure what caused it. You do not need to prove that finasteride is responsible before asking for help.

For the 1mg hair-loss dose, the current instruction is to stop if depression or suicidal thoughts develop and contact your doctor promptly. Do not wait to see whether the next hair photograph looks better. The NHS side-effects guide also gives emergency advice for thoughts of self-harm.

• Check the name and strength printed on your own medicine packet.
• Tell the clinician when the mood change began and how it affects you.
• Mention any previous depression, suicidal thoughts or mental-health treatment.
• Explain other recent medicine changes and anything else relevant to your health.
• Ask a trusted person for support if making contact feels difficult.

A family member or friend may notice a change before you do. You can tell someone you trust that you are taking the medicine and explain what you would want them to do if they became concerned. This is a practical support arrangement, not a request for them to diagnose you.

Describe sexual symptoms plainly

Reduced interest in sex, difficulty getting or maintaining an erection, and changes in ejaculation are all worth discussing. The current Propecia product information explains that sexual dysfunction may occur with or without mood changes. You do not need to be depressed for a sexual symptom to deserve attention.

It can feel awkward to raise this, especially during a short online appointment. Start with what has changed rather than searching for the perfect term. “My interest in sex has dropped since I started treatment” is a clear description. So is “I can get an erection, but it is harder to maintain than before.”

Contact your doctor for advice. The discussion may include whether treatment should be stopped, but do not invent your own alternate-day schedule or add another medicine to work around the problem. A different dose is still a treatment decision that needs clinical advice.

If sexual symptoms are also affecting your mood, say both things. They do not have to be dealt with as separate, unrelated appointments. Explain which part is most distressing and whether you are worried about your safety, relationship or ability to continue treatment.

What if symptoms continue after stopping?

Some men have reported sexual symptoms that continued after they stopped finasteride. This is recognised in NHS information and the MHRA warning. It would be misleading to promise that stopping will always make every symptom disappear immediately.

If you remain affected, arrange a review. Give the date you stopped, what has changed since then and which symptoms remain. Other causes may also need consideration. A clinician should assess your situation rather than assume that either the medicine or anxiety explains everything.

A written timeline can help you explain the sequence without having to reconstruct it each time. Keep it factual: start date, dose, symptom onset, contact with the prescriber, any advice received and the date of stopping if applicable. Leave room for uncertainty when you cannot remember an exact day.

Do not restart the medicine simply to test whether a symptom returns. If you are considering another hair-loss treatment, explain the previous problem first. The next decision should account for what happened, rather than treating a new prescription as an entirely fresh start.

Prepare for a useful prescriber conversation

When discussing possible finasteride side effects, the most useful account is specific and honest. There is no need to minimise a symptom because treatment was expensive or because you hoped it would work. Equally, you do not need to arrive certain of the cause. Your job is to explain the change; the clinician’s job is to help assess it.

Bring the following information if you can:

• Your medicine name, dose, start date and the pharmacy that supplied it.
• A description of the symptom and approximately when you first noticed it.
• Whether it is constant, intermittent, improving or becoming more difficult.
• Any other prescribed medicines, supplements or recent treatment changes.
• The action you have already taken and any advice you have received.

Ask what happens next, including who will review you and when. If a remote service suggests contacting your GP, ask what information should be shared so you do not have to repeat the whole history from memory. Keep a copy of any written advice for your own records.

For a routine follow-up message, put the key issue near the beginning. A short factual account is easier to act on than a long thread about delivery, price and symptoms mixed together. Urgent symptoms need urgent healthcare contact, not a message left in a general customer-service inbox.

Use the leaflet for your actual medicine

The Propecia patient leaflet is one example of licensed 1mg product information. Other manufacturers supply their own leaflets. Check the name and strength match your packet, and ask the pharmacy if you need help finding the right version.

A patient alert card is deliberately short. It highlights particular risks and actions, but it does not replace the full leaflet. Keep both. If you have a question about another condition, an allergy or another medicine, bring that to the prescribing assessment rather than assuming it is covered by a short online summary.

The NHS suitability information provides general background. It cannot confirm that treatment is appropriate for you. An accurate consultation should include the health details the clinician needs, even when you have used the medicine before.

Reporting a suspected side effect

You can report suspected finasteride side effects through the MHRA Yellow Card scheme. A report helps medicine-safety monitoring. It does not replace medical care or mean that the medicine has been proved to be the cause in your individual case.

Useful details for a report include:

• The medicine and strength, with the manufacturer if you know it.
• When treatment started and when the suspected reaction appeared.
• A clear description of the reaction and how it affected you.
• Other medicines or relevant health information requested by the reporting form.
• What happened after medical advice, stopping or another agreed treatment change.

Do not wait until you have assembled a perfect record before seeking healthcare. The medical conversation comes first when you are unwell. You can ask a pharmacist for help understanding the reporting process if the form feels difficult.

Why reports are not a personal risk calculator

A count of suspected reactions cannot tell you your own chance of developing a side effect. Reports do not include every person who used a medicine, and a reported event is not automatically proof of its cause. The MHRA explains this limitation when discussing its Yellow Card data. Avoid turning a headline number into a percentage without the information needed to support that calculation.

This does not make an individual report unimportant. It means a report and a controlled study answer different questions. For your immediate decision, use the current patient advice and discuss your own history. You do not need to settle the wider research debate before contacting a clinician about a symptom.

If a website gives a precise recovery deadline, check where it came from. An account of one person feeling better after a particular number of days is not a reliable timetable for everyone. Bring concerns about recovery to your doctor and agree when to review them again.

Keep a copy of any report reference with your treatment notes. That can make later updates easier if you are asked for more information about what happened.

Keep the wider hair-loss decision in view

Hair loss can affect confidence, and wanting treatment is understandable. It is still reasonable to reconsider a medicine if its effects on your wellbeing outweigh the benefit you feel you are getting. A review should make room for that discussion without pressuring you to continue.

Our guide to how finasteride works provides background on treatment expectations. For the assessment process, see our guide to obtaining finasteride through an online consultation. These guides do not replace advice about symptoms you are experiencing.

The NHS hair-loss guide describes different causes and treatment possibilities. If your diagnosis is uncertain or the pattern has changed, ask whether it needs reassessment. Another person’s treatment plan may not fit the reason for your hair loss.

Ask the prescriber what alternatives are relevant, what their limitations are and what happens if you choose no medicine for now. You can take time over a routine decision. That is different from delaying the urgent action described above for depression, suicidal thoughts or an immediate safety concern.

Questions people often hesitate to ask