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Critics of the paper, however, called its conclusions biased and bizarre.
“If you subtract the placebo group, 3% to 4% of patients may have some sexual side effects, and they go away when you stop the drug,” says Patrick Walsh, MD, the University Distinguished Service Professor of Urology at Johns Hopkins in Baltimore, who also reviews studies for the journal Urology. “This is bizarre.”
“I’ve never seen a patient who had sexual side effects and when he stopped them he was impotent forever,” says Walsh.
When asked if he gets any financing from drug companies, he said, “Absolutely I do not. No.”
Walsh has researched the effects of 5-alpha-reductase inhibitors for 42 years and recently testified in FDA hearings against their proposed use for prevention of prostate cancer.
“If you take a look at the randomized, controlled trials, something like 3% of placebo and 6% of treated patients will have some sexual side effects,” Walsh tells WebMD. “It’s one of the reasons why patients discontinue the drug and when they discontinue it, the problem goes away.”
How Many Men Are Affected?
Merck, the company that makes Propecia, did not respond to calls and emails for comment in time for publication, but according to Propecia’s web site, sexual side effects -- including loss of desire, erectile dysfunction, and decreased semen production -- are uncommon, “each occurring in less than 2% of men.”
Additionally, “these side effects went away in men who stopped taking Propecia because of them,” the site says.
But studies included in the review found rates of erectile dysfunction related to the use of 5-alpha-reductase inhibitors that were significantly higher, in the range of 6% to 8%.
Traish thinks that may be because men who stop taking medications because of side effects may not have been counted in the final analysis.
Studies in the review also found that about 4% of men taking a 5-alpha-reductase inhibitor, compared to 2% of men taking a placebo, experienced reduced sex drive.
Another trial found that 4.5% of men taking Propecia experienced growth of breast tissue compared to 2.8% who were taking a placebo.
The review also reported that several smaller studies had noted significant increases in depression in men taking Propecia compared to those on a placebo.