(WHAS11) -- More than a million men take Propecia each year to help male pattern baldness and it may be leading to sexual dysfunction.
A new warning about the most popular prescription medication to fight baldness says it can lead to sexual side effects to a small percentage of users. Researchers also say it can lead to depression and mental fogginess and that the side effects may linger long after they stop taking the drug.
Doctors say that each man who considers taking the drug to fight their baldness should be told there is a small, yet significant risk that they will suffer from the same side effects.
Despite the research showing a high number of healthy men under 40 suffering from the effects, the maker of Propecia, Merck, says there is "no causal relationship between Propecia and continued sexual dysfunction."