What is Finasteride Used For?

Katelyn Hagerty FNP

Medically reviewed by Katelyn Hagerty, FNP

Written by Our Editorial Team

Last updated 6/1/2021

Perhaps you’ve heard of finasteride from friends, your healthcare provider—or maybe you've read about it online. But what does this funny-sounding drug actually do? 

Finasteride is in a class of medications called 5-alpha reductase inhibitors, which work by blocking certain hormones. 

It’s a prescribed drug—often in conjunction with other medications to treat benign prostatic hypertrophy (an enlarged prostate gland). 

When prescribed for this purpose, finasteride treats urination problems, and usually with a 5mg dose.

Most commonly, though, finasteride is used to treat male pattern hair loss. Here’s how finasteride is used to treat a thinning mop.

Finasteride for Hair Loss

It’s important to understand that male pattern hair loss is very common and is nothing to be ashamed of. 

In fact, according to the American Hair Loss Association, about 85 percent of men will be affected by male pattern baldness by the time they turn fifty.  

Hair loss in men is most commonly caused by dihydrotestosterone (DHT), a hormone that attaches to receptors in your scalp and causes hair loss.  

Finasteride works by preventing testosterone from being converted into DHT, which in turn reduces the amount of DHT in the scalp.

A daily dose of 1mg of finasteride has been found to reduce the amount of DHT in the scalp by more than 60 percent

Because of this, most medical professionals will tell you this prescribed drug really works. 

Need more proof? When it was first investigated as a potential solution for hair loss, researchers discovered that about 83 percent of men who took finasteride during clinical trials stopped losing hair. 

What’s more, 66 percent of men experienced hair growth after regularly taking the drug for two years.

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What To Know Before Taking Finasteride 

Finasteride comes in topical and oral forms. Topical finasteride is not FDA-approved, but it has been shown to help with hair growth. 

This spray version also contains minoxidil, another topical hair loss treatment.

An oral finasteride tablet is the only prescription DHT-blocking medication that has been approved by the FDA to treat male pattern baldness. 

The brand name version of finasteride is called Propecia®, but generic finasteride has the same active ingredient and works just as well. 

Here are a few other important tips to know before taking finasteride: 

  • You have to be consistent. To prevent hair loss and encourage regrowth, you’ll want to take finasteride daily. To ensure DHT levels are reduced, take the medication close to the same time every day.

  • Patience is key. Seeing the results you desire may take some time. That could mean anywhere between three and 12 months before noticing increases in hair growth. And even then, finasteride is only effective as long as you are taking it.

  • It pairs well with minoxidil. While finasteride works great all by itself, it’s even more powerful when used alongside minoxidil—the over-the-counter topical treatment that boosts blood flow to stimulate hair regrowth.

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Side Effects of Finasteride

One thing to know about taking finasteride for pattern hair loss: There is a very low adverse reaction rate.

Side effects related to sexual dysfunction, though still rare, are the most common. 

In clinical trials for finasteride, 1.3 percent of users experienced erectile dysfunction and 1.8 percent reported a decrease in sex drive.

Other potential finasteride side effects include:

  • Ejaculatory dysfunction, like decreased volume of ejaculate testicular pain

  • Breast tissue enlargement

  • Depression

Of course, if you have any adverse reaction, you should contact a healthcare provider immediately.

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Finasteride & Minoxidil

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If you’re looking for something effective but don’t want too many steps in your routine, this once-a-day pill could be right for you.

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Clinically proven to regrow hair in 3-6 months, no pills required.

Interested in Taking Finasteride? 

If you’re dealing with male pattern baldness, there is hope for seeing an improvement in hair growth. 

Schedule time with a healthcare provider to get medical advice and discuss whether finasteride could be right for you. 

Another thing to ask is whether or not a combination of finasteride and minoxidil could benefit your hair loss situation, and help you get your mane back.

9 Sources

Hims & Hers has strict sourcing guidelines to ensure our content is accurate and current. We rely on peer-reviewed studies, academic research institutions, and medical associations. We strive to use primary sources and refrain from using tertiary references.

  1. 5-Alpha Reductase Inhibitor Information (2016). U.S. Food & Drug Administration. Retrieved from https://www.fda.gov/drugs/information-drug-class/5-alpha-reductase-inhibitor-information#:~:text=5%2Dalpha%2Dreductase%20inhibitors%20are,dutasteride%20(marketed%20as%20Avodart)
  2. Finasteride (2018). Medline Plus. Retrieved from https://medlineplus.gov/druginfo/meds/a698016.html#why
  3. Mens Hair Loss. American Hair Loss Association. Retrieved from https://www.americanhairloss.org/men_hair_loss/introduction.html
  4. Urysiak-Czubatka, U., Kmiec, M., Broniarczyk=Dyla, G., (2014, August). Assessment of the usefulness of dihydrotestosterone in the diagnostics of patients with androgenetic alopecia. Advances in Dermatology and Allergology, 31(4): 207-215. Retrieved from https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4171668/
  5. Drake, L., Hordinsky, M., Fiedler, V., et al. (1999, October). The effects of finasteride on scalp skin and serum androgen levels in men with androgenetic alopecia. The Journal of the American Academy of Dermatology, 41(4):550-4. Retrieved from https://pubmed.ncbi.nlm.nih.gov/10495374/
  6. McClellan, K., Markham, A., (1999, January). Finasteride: a review of its use in male pattern hair loss. Drugs, 57(1): 111-26. Retrieved from https://pubmed.ncbi.nlm.nih.gov/9951956/
  7. Highlights of prescribing information, U.S. Food and Drug Administration. Retrieved from https://www.accessdata.fda.gov/drugsatfda_docs/label/2014/020788s024lbl.pdf
  8. Ashique, S., Sandhu, N., Haque, S., Koley, K., (2020, October). A Systemic Review on Topical Marketed Formulations, Natural Products, and Oral Supplements to Prevent Androgenic Alopecia: A Review. Natural Products and Bioprospecting, 10, 345-365. Retrieved from https://link.springer.com/article/10.1007/s13659-020-00267-9
  9. Mysore, V., (2012, January-April). Finasteride and sexual side effects. Indian Dermatology Online Journal, 3(1), 62-65. Retrieved from https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3481923/#:~:text=In%20addition%2C%20the%20side%20effects,in%20%3C2%25%20of%20men

This article is for informational purposes only and does not constitute medical advice. The information contained herein is not a substitute for and should never be relied upon for professional medical advice. Always talk to your doctor about the risks and benefits of any treatment. Learn more about our editorial standards here.