Bernstein Medical - Center for Hair Restoration - Propecia Doesn't Work
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Recent news reports, coupled with warnings from Merck and the FDA, about Propecia’s possible persistent sexual side effects have caused growing concern about this popular hair loss treatment. An increasing number of men now fear that Propecia (finasteride 1mg) will cause permanent sexual dysfunction.

Merck’s and the FDA’s warning, however, was based on a small number of random self-reports, not on empirical studies that showed a cause and effect relationship between finasteride and sexual dysfunction. There are two possible reasons that existing studies have not found a significant relationship between finasteride use and persistent sexual dysfunction: 1) the effect of finasteride on sexual function is too small to significantly measure in any one study, or 2) finasteride has no significant negative effect on sexual function.

To address the first possibility, Aditya K Gupta and Andrew Charrette ((Gupta AK, Charrette A. The efficacy and safety of 5α-reductase inhibitors in androgenetic alopecia: a network meta-analysis and benefit-risk assessment of finasteride and dutasteride. J Dermatolog Treat. 2014;25(2):156-61.)) at the University of Toronto recently conducted a large scale meta-analysis across 16 controlled studies, studies designed to test the efficacy of finasteride, to see if a significant number of patients in those studies reported persistent sexual side effects. The rationale of a meta-analysis is that if there is an effect (of finasteride on sexual function) that is too small to measure in any one particular study, then it may be possible to detect the effect if one pools data from many different studies.

Gupta and Charrette analyzed the results of 16 studies that compared various doses of finasteride against a placebo and found that finasteride consistently proved effective in stopping or slowing hair loss. They also found that the number of self-reported cases of persistent sexual dysfunction by patients given finasteride was statistically no different from the number reported by patients given a placebo.

In other words, they found that finasteride was no more likely to cause persistent sexual dysfunction than a placebo.

This study supports the conclusion of existing literature that there is no correlation between finasteride use and persistent or permanent sexual dysfunction. That said, this is an important issue that still needs to be studied.

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Q: I have been using an increased dosage of Propecia now for around 8 months and Rogaine for about 6 months. I know that shedding can be expected for the first 3-6 months, but I believe I am now beyond that timeframe. Have you seen cases in which these products merely exacerbate hair loss without the expected regrowth? — N.E., Travilah, Maryland

A: It is a bit long to still see shedding, but from my experience, either the medications are working (and you are still in the shedding phase) or you are not responding to them. I have not seen minoxidil or finasteride worsen hair loss. My advice would be to continue the same course for at least a year before re-evaluating their use.

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Q: I am 27 years old and I have been on Propecia for 12 months now. Honestly, I have seen no response from it. In my dermatologist’s opinion I am a non-responder. I asked about Avodart and he said, since Propecia didn’t help then Avodart won’t help as well since both are DHT blockers, and if one didn’t work the other won’t either. In your opinion do you think Avodart is better? I have read that it blocks more DHT than Propecia. What is the dosing for Avodart? If someone does not respond to Propecia will they also not respond to Avodart? — A.C., West University Place, Texas

A: Avodart (dutasteride) is more effective than Propecia (finasteride) and some patients will respond to dutasteride who do not respond to finasteride. Dutasteride decreases serum DHT about 90% compared to 70% for finasteride. The usual starting dose of Avodart is 0.5mg a day.

That said, dutasteride is not FDA approved for use in hair loss and if a person has sexual side effects, the side effects are more likely to be persistent after stopping the medication compared to finasteride.

Read more about Avodart (dutasteride)

Read more about Propecia (finasteride)

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