Hair Loss & Finasteride: Does It Really Work?

What Is Finasteride?

Finasteride is a prescription-only oral medication and the most widely prescribed treatment for male pattern baldness (androgenetic alopecia) in the UK. Sold under the brand name Propecia, it is taken as a 1mg tablet once daily. It belongs to a class of drugs called 5-alpha reductase inhibitors.

Unlike topical treatments such as minoxidil, finasteride works systemically — tackling the hormonal root cause of male pattern hair loss rather than simply stimulating follicles from the outside. Men who want to buy generic Propecia online can do so via Access Doctor’s regulated online consultation service.

How Finasteride Works

The primary driver of male pattern baldness is dihydrotestosterone (DHT) — a hormone derived from testosterone. In genetically susceptible men, DHT binds to hair follicle receptors and gradually miniaturises them, causing hairs to become progressively thinner and shorter until the follicle stops producing hair altogether.

Finasteride works by inhibiting the type II 5-alpha reductase enzyme, which is responsible for converting testosterone into DHT. By blocking this conversion, finasteride reduces DHT levels in the scalp by up to 70%. Lower DHT means follicles are no longer being attacked — they stabilise, and many begin producing thicker, healthier hair again.

Does Finasteride Work?

The clinical evidence is robust. Large-scale, placebo-controlled trials published in peer-reviewed journals have consistently demonstrated finasteride’s effectiveness:

• 85% of men show improvement (hair maintenance or regrowth) after 5 years of continuous use
• Around 65% of users experience visible regrowth — not just a slowing of loss
• Men who took a placebo in the same trials continued to lose hair, confirming the drug’s effect
• Results are most pronounced at the vertex (crown) but also significant at the hairline

Finasteride is most effective when started early, before significant follicle miniaturisation has already occurred. If you have noticed early signs of hair thinning or recession, seeking treatment sooner rather than later gives you the best chance of maintaining and recovering your hair.

How Long Does Finasteride Take to Work?

Patience is essential. Many men abandon treatment before results become visible. Commit to at least 12 months before assessing effectiveness.

Side Effects of Finasteride

Finasteride is well tolerated by the vast majority of men. The most commonly discussed side effects relate to sexual function:

• Decreased libido — reported in approximately 1–2% of users in clinical trials
• Erectile dysfunction — similarly uncommon at the 1mg dose
• Reduced ejaculate volume — rare at the hair loss dose

These side effects, when they occur, usually resolve on stopping treatment or over time. The 1mg dose used for hair loss is significantly lower than the 5mg dose used for prostate conditions, which reduces the risk profile considerably.

Who Is Finasteride Suitable For?

Finasteride 1mg is suitable for adult men experiencing male pattern hair loss (androgenetic alopecia). It is not suitable for women. It is most effective in men with mild to moderate hair loss, particularly at the crown. It is generally less effective once hair loss has progressed to complete baldness at any given area. Read our guide to the Norwood scale stages to understand where your hair loss currently sits and how responsive it is likely to be to finasteride.

Getting Finasteride in the UK

Finasteride is a prescription-only medicine — it cannot be purchased over the counter. Access Doctor is a GPhC-registered online pharmacy. You complete a short online medical questionnaire, reviewed by our GPhC-registered pharmacist independent prescribers. If your consultation is approved, your finasteride is dispensed and dispatched in discreet packaging — typically arriving via Royal Mail Tracked 24 the next working day for orders before 3pm.