Lawsuits filed against Pfizer Inc. claiming that Viagra caused men to get skin cancer have been transferred to a judge in San Francisco by a federal judicial panel.
Thursday’s order by the U.S. Judicial Panel on Multidistrict Litigation coordinated the cases, now totaling more than 100, for pretrial purposes to U.S. District Judge Richard Seeborg. The suits, most of which were filed this week in the Northern District of California, have been brought by men diagnosed with melanoma or by the estates of those who died from the deadly form of cancer.
They cite studies finding that the enzyme used in Viagra, which the U.S. Food and Drug Administration approved in 1998 for the treatment of erectile dysfunction, causes a cell mutation that could develop into melanoma. In particular, a 2014 study in the Journal of the American Medical Association Internal Medicine found that men who took sildenafil, the active ingredient in Viagra, had an increased risk of developing melanoma by up to 84 percent.