What does it mean if your hair is getting thinner?

Thinning hair is because of a natural change to hair follicles caused by aging and DHT (dihydrotestosterone) which comes from testosterone. The hair tends to become thinner as the follicles age and shrink. The length of time of the growing phase of a hair follicle is also reduced.

How do I keep my hair from getting thinner?

Both the anti-DHT drug Propecia, its generic equivalent finasteride, and the scalp treatment Regaine can help to reduce hair thinning and eventual hair loss.

My dad went bald at 40 and my hair is getting thin - will I go bald too?

The tendency to develop thinning hair and balding is partly genetically determined. It can come from either of your parents. You are more likely than the general population to develop male pattern balding if a close relative already has it.

At what age do men start to lose hair?

There is no hard and fast answer, but at least half of male caucasians will have some hair loss by age 50. It can start in the 20s but more men become aware of it in their 30s and 40s. There is a genetic link, so men tend to follow a similar pattern to men in both of their parents' families.

What causes male pattern baldness?

Male pattern baldness or androgenic/androgenetic alopecia, is caused by the effect of a derivative of testosterone (DHT) on hair follicles in certain areas of the scalp. It causes shrinking of the hair follicles so reducing the thickness and eventually stopping the hair growth. It also reduces the length of time spent in the growing phase of the hair follicle cycle.

Further information:

Can you stop male pattern baldness (androgenic/androgenetic alopecia)?

It is not possible to stop it completely but the treatments finasteride, Propecia, and Regaine are very effective at reducing hair thinning. It does unfortunately continue to progress after stopping the treatments.

Is male baldness reversible?

Once baldness has developed, it is not possible to regrow the hair. Propecia/finasteride, and Regaine can help to delay total baldness by encouraging the hair follicles to grow thicker hair again.

Can women take finasteride/Propecia/Regaine?

Finasteride and Propecia are not recommended for women and in fact can damage an unborn child in pregnancy - so women should not even handle the tablets, especially if crushed or broken. There is a female version of Regaine which can be bought in pharmacies without a prescription (not available from Dr Fox).

What is the difference between Propecia and finasteride?

Both contain the same active ingredient which is finasteride. Propecia is the brand name used by the Merck pharmaceutical company for their finasteride 1mg tablets. Other pharmaceutical companies produce 1mg finasteride tablets, usually at lower cost, and these are known as generic Propecia.

Both branded and generic Propecia are equally effective. A lot of men have switched to generic due to cost savings and have not noticed any difference - read product reviews of finasteride 1mg.

See also generic medicines FAQs page.

How long should I take Propecia/finasteride 1mg for?

This is an individual choice and many men take Propecia/finasteride 1mg for many years. When you do choose to stop, the beneficial effects will be lost and hair loss will restart within 6-12 months from stopping.

Does Propecia/finasteride contain lactose?

Yes. Propecia and generic finasteride tablets both contain lactose.

How does Regaine work?

Regaine works by stimulating blood circulation to the scalp.

Video: How Minoxidil helps reverse hair loss

Video from Johnson & Johnson Limited.

Can I get Regaine in tablet form?

No. Regaine is a topical solution applied directly to the roots of the hair on the scalp. Minoxidil, the active ingredient in Regaine, is available as a tablet for the treatment of high blood pressure (not approved to treat hair loss).

Are there any side effects from Regaine?

You may notice a temporary increase in hair loss in the first 2-6 weeks. This is entirely normal as the hair follicles are being encouraged into the growth phase. Regaine occasionally causes skin irritation that usually resolves when the treatment is stopped. Very little of the active ingredient, minoxidil, is absorbed into the circulation and therefore general side effects are not expected. For more details see Regaine Extra Strength page and the manufacturer's patient information leaflet for Regaine.

Is the Regaine foam or solution better?

This is an individual choice. Both contain the same amount of active ingredient in a standard dose. The licence for Regaine foam is for 18 years to 49 years and for Regaine solution is 18 years to 65 years. In practice men up to 65 years and even beyond this age can use either one. If a medicine is used outside its licence the manufacturer is not liable in case of adverse events. Doctors take the responsibility for the prescribing.

Help - I started Regaine treatment and now my hair is falling out!

When Regaine is first started there may be a temporary increase in hair loss for the first 2-6 weeks. This is entirely normal and is good news - it shows hair is shifting from a dormant phase into an active growing phase. It should not last longer than a few weeks, after which your hair follicles should start to grow new hairs which will eventually become thicker and stronger. For further information about the hair growth cycle see Male pattern hair loss - DermNet NZ.

I have had chemotherapy - will Regaine help my hair to regrow?

There is no licence for use to encourage hair growth except in male pattern baldness. A small study in 1996, suggested that it may help after chemotherapy, but this has not been confirmed with further research.

I shaved my head - will Regaine help my hair grow back more quickly?

Regaine should not be used on a shaved scalp.

How long before I see a difference from using Regaine?

Occasionally there is increased hair shedding in the first 2-6 weeks. This is a positive sign as it shows that Regaine is stimulating the hair follicles and new hair growth will begin. In clinical studies 90% men said that they could see change after 16 weeks when used twice a day.

How long should I use Regaine for?

This is an individual choice, but when you do stop, the hair that has grown tends to disappear within 3 to 4 months and the pattern of hair loss will start again.

Can I use Regaine and finasteride together?

Yes they work in different ways to stimulate the hair follicles and are often used together with good results.

Is there anybody who can't use Regaine?

Regaine Extra Strength supplied by Dr Fox should NOT be used by women (a specific women's formulation is available to buy in many pharmacies). It should not be used if your hair loss is sudden or patchy; is associated with other conditions; if you have a red, inflamed, irritated, infected, or painful scalp; if you have a shaved head, are wearing a dressing or bandage; or are sensitive to any of the ingredients. Discuss with your GP before using if you have heart disease or high blood pressure, even if being treated. More information in Regaine PIL. There are checks in the hair loss assessment.

Is Regaine dangerous to children?

If swallowed, Regaine is very dangerous to children - it could lead to serious heart toxicity. Regaine, and all other medicine, MUST be kept away from children.

How does Propecia/finasteride work?

In men with male pattern baldness, their hair follicles are highly sensitive to DHT. DHT speeds up the rate of hair loss by making the hair thinner until it can no longer break the surface of the scalp. Propecia/finasteride inhibits (blocks) the production of DHT from testosterone. Hairs usually go through a life cycle of growth, rest, and falling out. They naturally fall out and regrow in the same place. Propecia/finasteride works at the level of hair follicles to increase the thickness of the hairs and the length of the growth phase.

Are there any side effects from Propecia/finasteride?

Most men tolerate Propecia/finasteride 1mg well and side effects are uncommon. There is an increased risk of decreased libido, erectile dysfunction, or other ejaculation disorder, but this is not generally severe enough to prevent continued drug use. If drug use is stopped then these symptoms will generally resolve. However, there are some rare case reports of diminished libido or erectile dysfunction persisting after stopping the drug.

I have depression, can I use Propecia/finasteride?

Depression or taking antidepressant medication does not stop you using Propecia/finasteride 1mg tablets. There have been some rare reports of men developing depression including suicidal thoughts whilst taking Propecia/finasteride. If low mood or depression develops, stop treatment and consult your GP straight away.

Is there anybody who shouldn't take Propecia/finasteride 1mg?

Do not take Propecia/finasteride and consult a GP if hair loss has been rapid and recent, is patchy or irregular, or comes out in clumps, if there is scalp inflammation, or where there are also other symptoms of serious illness, such as unexplained weight loss, fevers, persistent diarrhoea, or excessive fatigue.

If you already take finasteride, or take dutasteride for enlarged prostate, then you cannot take Propecia/finasteride 1mg for hair loss.

My partner is pregnant/trying to get pregnant - can I use Propecia/finasteride?

Pregnant women should not come into contact with finasteride. Crushed or broken tablets of Propecia/finasteride should not be handled by women when they are pregnant or are trying to get pregnant as it may affect the baby's genital organ development. There are some reports of reduced fertility in men who took finasteride for a long time and had other risk factors that may affect fertility. Semen quality is reported to improve again on stopping the treatment.

Are there any long-term side effects of taking Propecia/finasteride 1mg?

There have been some reports of longer term issues mainly related to diminished libido or erectile dysfunction. In 2017, the NHS reviewed new research and concluded that stopping the drug would resolve sexual problems in nearly all cases. An editorial in the British Medical Journal in 2019 supported this position but suggested a need for further research. This is sometimes termed Post Finasteride Syndrome, but at present doctors don't have the research data to confirm persistent drug related problems.

Hair loss treatment
Dr Amanda Wood

Authored 01 December 2020 by Dr A. Wood
MB ChB Manchester University 1984. NHS GP in Bristol.

Reviewed by Dr Tony Steele, Dr B. Babor, Dr P. Hunt
Last reviewed 01 December 2020
Last updated 1 December 2020