If you are a man with hereditary hair loss, there are products available to help you keep your hair. One option is finasteride (Propecia), a prescription medication that is in tablet form and taken orally.
How Finasteride Works
Finasteride was first developed to shrink enlarged prostate glands. Researchers noticed that it also helped grow hair, so a special lower-dose formulation—Propecia—was developed for hair loss.
Finasteride interferes with conversion of testosterone to another hormone called 5 alpha-dihydro-testosterone (or DHT). DHT reduces hair follicle activity. Over time and under the influence of DHT, follicles sprout thinner hairs until no hair regrows. When finasteride blocks DHT production, thinning of hair ceases and a more normal growth may possibly occur.
The Good News and the Bad News
A review of multiple trials including thousands of men and lasting up to 2 years found that taking finasteride was associated with improved hair growth and increased hair count, but that is also associated with erectile dysfunction and other sexual problems.
But, it is not only finasteride's ability to grow hair that interests some doctors. Finasteride may help men to stop losing the hair they have. So it appears that even if finasteride does not help you grow lots of new hair, it may allow you to keep what you have—at least for a while.
You must be patient, though, and be willing to take the drug once a day indefinitely. It may take 3-4 months before new hair is noticed. If you stop taking the drug, all of your newly grown hair will fall within a year. Also, taking the medication every day can be expensive.
Finasteride has some potentially unsettling side effects. The medication has been associated with breast tenderness, a reduced sex drive, problems with ejaculation, and orgasm disorders that continue even after you stop taking the drug. Male infertility and poor semen quality are also possible with finasteride, but these problems should improve after you stop taking the drug.
If you are taking the medication, be sure that your doctors knows. One effect of taking finasteride is that it will lower PSA, a compound produced by the body in the presence of a prostate cancer or just with increased age. Blood tests checking for PSA levels may be more difficult to interpret as a result of the medication being in your system. If you have both hair loss and symptoms of prostate enlargement (hesitancy in urinating or diminished urinary stream), you may find that these symptoms improve because the medication is also used to treat benign prostatic hypertrophy.
If you have hereditary hair loss, there are treatment options available. Talk to your doctor about whether you are a good candidate to take finasteride. Other options available include hair transplant surgery and the over-the-counter product minoxidil (Rogaine).
American Academy of Dermatology
American Hair Loss Council
Canadian Dermatology Association
Androgenetic alopecia. EBSCO DynaMed website. Available at: http://www.ebscohost.com/dynamed. Updated December 9, 2014. Accessed April 28, 2016.
Hair loss. American Academy of Dermatology website. Available at: http://www.aad.org/media-resources/stats-and-facts/conditions/hair-loss. Accessed April 28, 2016.
Hawk E, Breslow RA, Graubard BI. Male pattern baldness and clinical prostate cancer in the epidemiologic follow-up of the first National Health and Nutrition Examination Survey. Cancer Epidemiol Biomarkers Prev. 2000;9(5):523-527.
Kaufman KD, Rotonda J, Shah AK, Meehan AG. Long-term treatment with finasteride 1 mg decreases the likelihood of developing further visible hair loss in men with androgenetic alopecia (male pattern hair loss). Eur J Dermatol. 2008;18(4):400-406.
Leyden J, Dunlap F, Miller B, et al. Finasteride in the treatment of men with frontal male pattern hair loss. J Am Acad Dermatol. 1999;40(6 Pt 1):930-937.
Finasteride. EBSCO DynaMed website. Available at: http://www.ebscohost.com/dynamed. Updated April 6, 2016. Accessed April 28, 2016.
Shapiro J, Kaufman KD. Use of finasteride in the treatment of men with androgenetic alopecia (male pattern hair loss). J Investig Dermatol Symp Proc. 2003;8(1):20-23.
Last reviewed April 2016 by Michael Woods, MD Last Updated: 6/4/2014