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Dutasteride Drug Trial for Male Hair Loss, Completed

The results of a long-term study into Japanese men with the hair loss condition Male Pattern Baldness have been published in the Japanese Journal of Dermatology.

The study, which was funded by pharmaceutical giant GlaxoSmithKline (GSK), was centred on a drug named dutasteride, which is broadly similar to the existing, clinically-proven hair loss drug finasteride in that it helps to stop the production of DHT, the testosterone by-product that leads to follicle shrinkage and hair loss in men who are genetically predisposed to be sensitive to it.

clinical-trial-hair-loss-drugsEfficacy and side effects

Key goals of the Japanese study were to assess the efficacy of the drug, and also to understand what kind of side effects participants in the trial reported.

The results appear to be quite promising. Just over 100 men aged between 18 and 65 were given dutasteride 0.5mg daily for 52 weeks, and the study report states that hair growth, hair restoration and the overall appearance of the hair improved throughout the study.

The researchers also appear optimistic about the side-effects, stating that nasopharyngitis (an inflammation of the mucus membranes), erectile dysfunction and decreased libido were the most frequently reported adverse events, but that “most adverse events were mild.”

In summing up, the Japanese research team says that “as a potential future treatment option for male Androgenetic Alopecia (Male Pattern Baldness), dutasteride 0.5mg exhibited long-term safety, tolerability and efficacy within this study population.”

As the trial was of a small scale, however, we understand that more wider reaching research, involving more participants in various locations and taking place over a longer period of time, is still likely to be necessary in order to build a fuller picture.

Oral inhibitor

Dutasteride is an oral inhibitor of both type 1 and type 2 5αR. It was first approved worldwide for the treatment of benign prostatic hyperplasia (BPH) and was approved in Korea in 2009 for the treatment of Androgenetic Alopecia in men.

Earlier this year, production of a dutasteride product being manufactured under the brand name Zagallo was interrupted “indefinitely” after irregularities were found at the French plant where it was being made.

Production of Zagallo ground to a halt after “out-of-place softgel capsules in several product batches were detected during quality control procedures.” These were removed prior to distribution to patients. It is not known if production has since resumed, nor is it known if Zagallo was the drug used in the Japanese trial, though it is certainly possible as Zagallo is a GSK drug.

According to the clinicaltrials.gov website, GlaxoSmithKline has also sponsored a bioequivalence study of dutasteride within the past few years.

ChristinaWhile dutasteride products have not been licenced for use on Male Pattern Baldness in the UK – possibly due to concerns over the “half-life” of the drug (it stays in the body much longer than some other hair loss drugs) – it is possible that GSK may pursue wider clearance for it if it proves to be a success in Japan.

Belgravia superintendent pharmacist, Christina Chihaker (pictured), advises: “At present finasteride 1mg is the only drug approved by the FDA and MHRA for the treatment of androgenetic alopecia. Both finasteride and dutasteride are classed as Testosterone-5 alpha reductase inhibitors. Although both of these drugs have a similar mechanism of action and side effects there are differences. One of the most significant differences is the half-life of these drugs.

Finasteride has a half-life of approximately six hours in men aged 18-60 and increases to approximately eight hours in men aged more than 70. The half- life of dutasteride also increases with age. It is approximately 170 hours in men aged 20-49 years, approximately 260 hours in men aged 50 -69 years and approximately 300 hours in men aged over 70.

In plain terms this means that dutasteride takes weeks or even months to be eliminated from the system after discontinuation of treatment, whereas finasteride will be almost totally eliminated in about 3 days. For both of these drugs any of the known potential side effects appear to diminish with time. However, as the elimination half-life of dutasteride is much longer than that of finasteride, it will take longer for any side effects to diminish or dissipate following discontinuation of the drug. I think that although Avodart is a similar class of drug to finasteride 1mg, it would not be a good addition to the hair loss market.”

Alternatives to dutasteride

Recent predictions for the short term future of the worldwide hair loss drug market suggest that dutasteride may potentially be made available in Europe and the USA between 2017 and 2020. So what do men who want to halt their hair loss now, do?

mens-hair-loss-treatmentIn the UK there are two medically-proven and MHRA-licensed products for the treatment of Male Pattern Baldness, which, when prescribed as part of a bespoke hair loss treatment course, have been seen to produce significant regrowth results in many cases.

The first is finasteride 1mg – another oral inhibitor – which is taken in tablet form once per day. This drug inhibits the formation of the DHT which causes genetic hair thinning, stabilising hair loss and helping to prevent further deterioration of the affected follicles around the top of the scalp and hairline.

When used alongside finasteride as part of a combination course – especially in cases of a receding hairline or a fairly advanced thinning crown, which can be otherwise stubborn to treat – Belgravia’s specialists find high strength minoxidil to be a potent option; the second recommended treatment component. This is applied directly to the thinning areas in order to promote accelerated hair growth and helping to maximise the hair’s potential.

Many Belgravia clients – from those who visit our Central London hair loss clinics, to those based throughout the UK and abroad who follow our home-use treatment courses – find this a fruitful route to preventing further shedding and promoting hair regrowth, as the examples featured in our Success Stories gallery demonstrates.


circ Male Pattern Hair Loss Treatment Results - Belgravia Centre LondonThe Belgravia Centre

The Belgravia Centre is the leader in hair loss treatment in the UK, with two clinics based in Central London. If you are worried about hair loss you can arrange a free consultation with a hair loss expert or complete our Online Consultation Form from anywhere in the UK or the rest of the world. View our Hair Loss Success Stories, which are the largest collection of such success stories in the world and demonstrate the levels of success that so many of Belgravia’s patients achieve. You can also phone 020 7730 6666 any time for our hair loss helpline or to arrange a free consultation.


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