What are the side effects of Finasteride?

The Big Picture

Clinical studies show that Finasteride is well-tolerated by most men, with 98.6% of participants in trials experiencing no serious side effects. Here’s what you need to know:

Common Side Effects

A small percentage of men may experience mild effects that often resolve on their own, such as:

• Temporary dizziness
• Slight weakness
• Mild swelling in the hands

Sexual Side Effects

While widely discussed in the media, sexual side effects are rare:

• Occur in less than 2% of men
• Usually reversible if they do occur
• May include:
  • Changes in libido
  • Erectile function changes
  • Ejaculation changes

Important Context

When considering side effects, it’s important to note:

• Most reported sexual side effects are linked to the higher 5mg dose (used for prostate treatment), not the 1mg dose for hair loss
• No statistically significant link has been found between the 1mg dose and sexual side effects
• Most side effects resolve either while continuing treatment or after stopping

Monitoring Your Treatment

At MANUAL, we provide ongoing support throughout your treatment:

• Regular check-ins – Our clinical team monitors your progress
• Easy access to support – Message our clinicians through your account with any concerns
• Personalised care – We can adjust your treatment plan if needed

When to Seek Help

While serious side effects are extremely rare, support is always available:

• For mild concerns – Message our clinical team through your account
• For immediate support – See below
• For urgent issues – Contact your GP

Are you experiencing Side Effects or you would you like to speak to someone about your Hair Loss plan and progress?

Call 020 4538 8411 and press Option 3 to speak with a clinician.

• Available Monday to Friday
• Hours: 09:00 - 17:00