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How Long Before Propecia Begins Working?

Men who experience male pattern hair loss have convenient treatment options.

Men who experience male pattern hair loss have convenient treatment options.

Propecia is the brand name of a prescription drug called finasteride, and it is used as a treatment for male pattern baldness, the most common type of hair loss.

Male pattern hair loss happens because hair follicles are susceptible to a process called androgenic miniaturization. Hair follicles shrink and eventually stop producing hair due to the conversion from ordinary testosterone to a form of testosterone called DHT. Some men’s scalp hair follicles respond to increasing levels of DHT by shrinking and producing thinner hair, until sometimes stopping hair production altogether. It affects up to 70% of men over their lifetimes.

Propecia works by blocking the conversion of testosterone into DHT, and in many men, this process puts a stop to male pattern hair loss. In fact, 90% of men taking Propecia over five years either grow new hair or do not lose more hair, while 75% of men taking a placebo continue to lose hair. The following table outlines the effectiveness of five years of treatment with Propecia versus placebo:

Effect of Treatment Men Taking Propecia Men Taking Placebo
Increase in hair growth 48% 6%
No new hair loss 42% 19%
Continued hair loss 10% 75%


Immediate Effects of Taking Propecia

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Propecia at the standard dosage of 1 mg/day starts having an effect immediately. Ultimately, it can decrease serum DHT levels by around 70%. Serum testosterone levels increase slightly, but within the range of what’s considered normal. During the first couple of months taking Propecia, some men experience additional hair shedding, which can be alarming. However, this is normal, and actually indicates that the Propecia is working.

Because hair growth takes time, it generally takes up to 3 months to notice a difference after taking Propecia every day. Thickening and strengthening of hairs that have become miniaturized tends to take six to 12 months.

What the Science Says About Onset of Benefits

Due to factors like individual rates of hair growth, doctors typically tell patients taking Propecia for male pattern baldness to give the drug 6 months to a year before deciding whether it’s helping or not. The first three months or so you may not see a change (aside from the possibility of some additional hair shedding, as mentioned above).

Doctors also say that how you respond to Propecia during the first year of taking it is an indicator of how effective your long term treatment will be. The better the results during the first year, the more likely you’ll have continued positive results over the long term. Additionally, men over 30 tend to have better hair growth long term than younger men taking Propecia.

What Users Say About Onset of Benefits

If you read through discussion forums about Propecia, you’ll find that experiences vary significantly. Some men report that they notice a halt to additional hair loss right away, and others report taking the drug for a couple of years before having a noticeable difference in their hairline. While anecdotes aren’t data, there does seem to be a trend of men with less aggressive hair loss reporting better results while taking Propecia. Additionally, despite studies showing better effectiveness in men over 30, you’ll also have little trouble finding reports from younger men of experiencing excellent results too. Also some men do not notice extra shedding at first, and have reported almost immediate cessation of the level of shedding they had been experiencing.

Advantages of Starting Propecia Early

Propecia appears to work best in men who don’t wait until thinning is advanced.

Propecia appears to work best in men who don’t wait until thinning is advanced.

Propecia’s effects are in general limited to areas of the scalp that are thinning, but where there is still hair present. In areas that are completely bald, regrowth is rare. While Propecia can produce regrowth, its main benefit appears to be its ability to slow or stop male pattern hair loss. If you want optimal results, it’s generally best to start taking Propecia as soon as possible after the onset of hair loss. Even delaying for a year can prevent men from “catching up” to the results seen by men who start taking it early.

One study showed that men who took a placebo for a year experienced increased hair loss. When switched over to Propecia, they did increase hair counts, but were not able to obtain the level of results seen by men who did not delay taking it. It appears that, similarly to having a tooth cavity addressed early, addressing hair loss early with Propecia works better than waiting.

To Continue to Benefit, You Have to Keep Taking It

It’s important for men to remember that Propecia is not a “cure” for baldness in the sense that you take it, regrow hair, and can then stop taking it. Propecia is a long term drug. You generally have to take it for several months to a year to learn how well it works for you. Additionally, if you’re pleased with the results, you have to continue taking it to continue experiencing the benefits. If you stop taking the drug, you can expect for your hair loss to resume.


Propecia has worked well for many men. In 2008, manufacturer Merck made nearly $430 million on sales of the drug. In 2010 it was the 189th best-selling pharmaceutical. But taking Propecia is a long term commitment. It takes time for results (or lack thereof) to become apparent, and results have to be maintained by continuing to take the medication. That said, Propecia has plenty of fans who are happy to have a convenient way to address a condition that many men would rather not have. If you choose to try Propecia, don’t expect an immediate change (though you may notice less hair loss right away), and give the drug time to work based on how fast your hair normally grows, and how long you’ve noticed male pattern hair loss.

At AccessRx.com, we’re in the business of working with US-licensed pharmacists to dispense medications that can make a noticeable difference in quality of life, including Propecia and generic finasteride. We offer the convenience and discretion of quick shipping right to your door, and are committed to the best possible customer experience. AccessRx.com also uses only the most advanced technology to ensure your online privacy and security when working with us are fully protected.

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About Don Amerman

Don Amerman has spent more than three decades in the business of writing and editing. During the last 15 years, his focus has been on freelance writing. For almost all of his writing, He has done all of his own research, both online and off, including telephone and face-to-face interviews where possible. Don Amerman on Google+