In short

  • Finasteride (Propecia) is an effective hair loss treatment for men.
  • The active ingredient works by blocking the enzyme responsible for converting testosterone into dihydrotestosterone (DHT).
  • DHT is the primary culprit of hair loss in men.

Finasteride (Propecia) is an effective hair loss treatment for men. The active ingredient works by blocking the enzyme responsible for converting testosterone into dihydrotestosterone (DHT). DHT is the primary culprit of hair loss in men. 

By reducing the levels of DHT in the body, there is less DHT causing the hair follicles to shrink. This allows hair follicles to grow in size, and for hair to regrow. However, Finasteride does not affect hair growth in all areas of the body; it only targets the hair on the scalp. 

How Effective is Finasteride?

To start to see effects from Finasteride, it needs to be taken for at least 3-6 months of daily usage. Finasteride works in 90% of men who use it for male pattern baldness. It is most effective when used for mild to moderate hair loss. There is limited evidence to show its effectiveness in helping with severe hair loss or a receding hairline. 

How to Take Finasteride?

Finasteride comes in 1mg tablets, which should be taken each day around the same time. Taking it at the same time each day allows it to maintain the DHT levels in your body. Take the tablet whole and swallow it with some water, without breaking or crushing it. Finasteride can be taken with and without food. If you forget to take the medication at the right time, just take it as soon as you remember. Do not double up on doses if you miss one. 

Stopping Finasteride: What Happens When You Stop Taking Finasteride?

Finasteride only prevents hair loss when the drug is active in your body. This means it will not continue to have an effect after you stop taking the medication, as your body will be able to re-start converting testosterone to DHT. This will cause your hair follicles to shrink, and your hair will start to fall again. 

The half-life of Finasteride is around 5-6 hours in most men under 60, and about 8 hours in men over 70. This short half-life is why it needs to be taken daily and around the same time. 

The levels of Finasteride in your body will reduce slowly over several days after you stop taking the medication. Finasteride isn’t a medication that has permanent effects; it needs to be taken regularly for a long time for it to have long-term effects on stopping hair loss.

Finasteride Side Effects After Stopping 

Finasteride shouldn’t give you any side effects after stopping. If you notice any side effects, they should resolve in around a week, as Finasteride has a short half-life and should be excreted from the body quickly. 

Clinical trials following men over 10 years have shown Finasteride is safe to use for a long period and only 6.8% of participants notice mild and reversible side effects, mainly sexual side effects (including erectile dysfunction and premature ejaculation).

Finasteride Alternatives

Here at Simple Online Pharmacy, we supply a number of alternatives to Finasteride. We stock Propecia, which is the branded version of finasteride. This should be roughly as effective as finasteride, with the same chemical makeup and similar side effects and half life.

We also stock Regaine (minoxidil), which comes in foam and solution formulations. Regaine is a topical treatment, meaning it is applied directly to the scalp to promote hair growth. Regaine can also be used in conjunction with Finasteride, to give you the best chance of hair regrowth. We also stock Regaine for Women – due to affecting hormone levels, these treatments do need to be separated along gender lines.

How to Order Finasteride 

At Simple Online Pharmacy, you can order Finasteride after completing an online assessment. One of our doctors will review your answers, and if they have no concerns, will prescribe you medication and we will post it straight to your doorstep.

Sources

References

2 sources were selected to match the subject of this article. Link destinations were checked twice when added. This does not mean every statement has been individually source-mapped or clinically approved.

  1. Propecia 1 mg Film-Coated Tablets — Summary of Product Characteristics

    electronic medicines compendium (emc) · HTML · SmPC · Last updated on emc 14 July 2026 · Link destination checked 5 September 2026

  2. How and when to take finasteride

    NHS · HTML · medicine dosing guidance · Page last reviewed 2 August 2023 · Link destination checked 5 September 2026

Reference links open the cited source pages. If you spot something out of date, tell our content team.

Who wrote this

Written and reviewed by our team

Authored by

Safiyyah Ramzan

Content Writer

Safiyyah started working with Simple Online Pharmacy in 2023 and is currently working towards a degree in medicine. With her clinical knowledge, she aims to write clinically sound content that is easy to understand for all audiences.

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Medically reviewed by

Karim Nassar, Co-Founder, Pharmacist & Author

Karim Nassar

Co-Founder, Pharmacist & Author

Karim is a registered pharmacist with the General Pharmaceutical Council (GPhC) and was a founding member of Simple Online Healthcare in 2015. With a Master of Pharmacy degree from Strathclyde University, Karim brings a strong foundation in pharmaceutical care and a passion for leveraging digital solutions to improve patient access to healthcare.

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