Researchers from various institutions, such as Harvard and Brown Universities, analyzed data from a study of over 26,000 men to see how cancer rates compared to those who took Viagra to those who didn’t.

They found that 6 percent of the men had taken Viagra, which suggested they had double the risk of developing melanoma that the men who didn’t take the drug.

“This is an observational population study – it’s an association not a demonstration,” Professor Robert McLachlan, director of Andrology Australia, told ninemsn. “The drug may also tickle up those early melanoma cancer cells to go feral.”

McLachlan said further research is needed in order to determine a link.

via Study: Viagra Can Increase Risk Of Developing Skin Cancer « CBS Atlanta.