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How common are finasteride side effects?

Picture of Andrew Bellingham

Andrew Bellingham

Pharmacist | 20+ Years | BPharm | Dip Clin Pharm

Finasteride is a medication widely recognized for its effectiveness in treating male pattern baldness, a condition that affects a significant number of men as they age. You might know it by the brand name Propecia, among others. If you’ve noticed your hairline receding or thinning at the crown, you’re not alone—this is a common experience for many men.

So, what makes finasteride so popular? Essentially, it tackles one of the main causes of hair loss. For those struggling with the distress and self-consciousness that often accompany thinning hair, finasteride offers hope. The prospect of slowing down or even reversing hair loss can be incredibly appealing, restoring not just hair but also confidence.

How common are side effects of finasteride?

Of course, deciding to take any medication involves weighing the pros and cons. It’s only natural to wonder about potential side effects. If you’re thinking about starting finasteride, understanding how common these side effects are will help you make a well-informed decision.

Common side effects - more than 1 in 100 people

Initial Shedding

One of the side effects you might experience when starting finasteride is an initial increase in hair shedding. This can be alarming, but it’s a sign that the medication is beginning to work. As your hair follicles adjust, this shedding typically slows down and eventually leads to new growth.

Sexual side effects

Some men report experiencing sexual side effects such as decreased libido, erectile dysfunction, and reduced semen volume. According to studies, these effects occur in a small percentage of users, approximately 1-2%. 

Serious side effects - less than 1 in 1000 people

Tenderness around your nipples - call 111 or visit 111.nhs.uk

Finasteride can sometimes cause breast tenderness or enlargement. This side effect is uncommon but important to monitor, as it could be a potential sign of breast cancer. 

Depression

While not very common, some users have reported experiencing severe depression or mood changes while taking finasteride. If you notice any significant changes in your mood or mental health, you should stop taking finasteride straight away and consult your pharmacist or doctor. 

Additionally, if you’re having serious thoughts of harming yourself, call 999 or visit A&E.

Allergic Reactions - call 999 immediately

In rare cases, some people experience allergic reactions to finasteride, such as rash, itching, hives, and swelling of the lips or face. If you develop any signs of an allergic reaction, you should stop taking the medication and seek immediate medical attention.

Frequently asked questions about finasteride

Can finasteride cause long-term side effects?

Yes, finasteride can cause permanent side effects in rare cases, such as persistent sexual dysfunction. If you experience ongoing issues, consult your doctor for guidance.

How can I minimise the side effects of finasteride?

To minimise finasteride side effects, follow your doctor’s dosage recommendations, monitor your body’s response, and report any adverse effects to your healthcare provider promptly.

Do finasteride side effects go away after stopping the medication?

Finasteride side effects often go away after stopping the medication, but some, like sexual dysfunction, can persist. Always consult your doctor before making changes.

A man checks his hair in the mirror to check his hair growth after using rosemary oil.

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