In June 2014, JAMA Internal Medicine published a study which reported that users of the drug Viagra were 84 percent more likely to develop skin cancer over a 10-year period.
The study looked at 26,000 men, finding that those who had taken Viagra, 6 percent of the total, had roughly double the risk of developing melanoma than those who never took the drug. Among subjects who were actively taking the drug, the risk of developing melanoma was 84 percent greater, the study suggested. The study's authors are affiliated with Harvard Medical School, Brown University, Indiana University and Tianjin Medical University in China.
Lawyers filing suit will have to demonstrate that taking the erectile dysfunction drug was the cause of the plaintiffs' skin cancer. Some have criticized the JAMA study for merely showing a correlation.
The nature of the connection between Viagra use and melanoma is likely to be at the center of the litigation.