Does Finasteride Work for Hair Loss?

Yes. Finasteride works for many men with male pattern hair loss, also known as androgenetic alopecia. It is a prescription medicine that helps reduce the effect of DHT, the hormone strongly linked to genetic hair loss in men.

Finasteride is best understood as a treatment that helps slow, stop or stabilise hair loss. Some men also notice visible regrowth or thicker-looking hair, but regrowth is not guaranteed.

For many men, a good response to finasteride means:

• shedding reduces
• hair loss slows down
• existing hair is maintained
• thinning areas look more stable
• hair may look thicker over time

Finasteride is not a cure for male pattern baldness. It only works while it is being taken. If treatment is stopped, DHT levels gradually rise again and hair loss is likely to continue.

Finasteride works by blocking an enzyme called 5-alpha reductase. This enzyme converts testosterone into dihydrotestosterone, also known as DHT.

DHT is the hormone strongly linked to male pattern hair loss. In men who are genetically sensitive to DHT, it binds to hair follicles and causes them to gradually shrink. This process is called follicle miniaturisation.

As follicles miniaturise, they produce hairs that are:

• thinner
• shorter
• weaker
• less visible on the scalp

Over time, affected follicles may stop producing visible hair.

By lowering DHT levels, finasteride helps reduce further follicle miniaturisation. This can help protect existing hair, slow further loss and, in some men, allow miniaturised hairs to become thicker over time.

Finasteride is also used at a higher dose to treat benign prostatic hyperplasia, or BPH. In BPH, DHT contributes to prostate enlargement. Lowering DHT can help shrink the prostate and improve urinary symptoms.

Finasteride lowers DHT by blocking 5-alpha reductase. DHT is the hormone that drives follicle miniaturisation in male pattern hair loss.

Lowering DHT does not create instant new hair. Instead, it helps reduce the hormonal pressure on sensitive hair follicles. This can slow hair loss and give affected follicles a better chance of maintaining thicker, stronger hair.

This is why finasteride is often described as a maintenance treatment. It helps protect the hair you still have, and some men may also see regrowth.

Finasteride is considered an effective treatment for male pattern hair loss when taken consistently.

Clinical studies show that finasteride can stop further hair loss in around 80-90% of men, while many men also see visible regrowth or improved hair thickness over time.

However, expectations should be realistic. Finasteride is usually better at maintaining existing hair than restoring areas that have been completely bald for a long time.

Finasteride is more likely to work well if:

• hair loss is in the early stages
• thinning is mild to moderate
• the crown or top of the scalp is affected
• there are still miniaturised hairs in the thinning area
• treatment is taken consistently
• treatment is started before follicles become inactive

No. Finasteride is not a cure for male pattern hair loss. It is a long-term treatment that works while it is being taken. 

If you stop taking finasteride, DHT levels gradually return to their previous level. Over time, hair loss is likely to continue, and hair maintained by treatment may be lost. 

Finasteride is more likely to help men who:

• have male pattern hair loss
• are in the early or moderate stages of thinning
• have thinning at the crown or top of the scalp
• still have visible hair in the thinning areas
• are able to take treatment consistently
• understand that results are gradual and maintenance-based

Finasteride is less likely to restore hair in areas that are already completely bald.

Finasteride is not suitable for everyone. You should speak to a prescriber before using finasteride if you:

• have a history of depression or suicidal thoughts
• have experienced sexual side effects with similar medicines
• have breast changes such as lumps, pain or nipple discharge
• have liver problems
• are trying for a baby and have concerns about fertility
• are unsure whether your hair loss is male pattern hair loss

Finasteride 1mg for hair loss is prescribed for men. It is not suitable for women who are pregnant or may become pregnant because it can harm a developing male baby.

Further reading: Finasteride side effects

Patients taking finasteride 1mg for hair loss should stop treatment and seek medical advice if they develop depression or suicidal thoughts.

Patients should also speak to a healthcare professional if they experience sexual side effects such as reduced libido, erectile dysfunction or ejaculation changes.

For more information, read the MHRA safety update on finasteride.

Finasteride does work for many men with male pattern hair loss, especially when treatment is started early and taken consistently.

Its main benefit is helping to slow, stop or stabilise further hair loss by lowering DHT. Some men also see improved hair thickness or visible regrowth, but this varies from person to person.

Finasteride is a long-term treatment, not a permanent cure. It also carries important safety considerations, including MHRA warnings about sexual side effects and mood changes. A clinical assessment is important before starting treatment to make sure it is suitable.