1. Center for Drug Evaluation and Research. Food and Drug Administration Web site. Postmarketing safety of sildenafil citrate (Viagra): Summary of reports of death in Viagra users received from marketing (late March) through June 1998. Available at http:/www.fda.gov/cder/consumerinfo/viagraupdate721.htm. Accessed July 22, 1998.
2. Center for Drug Evaluation and Research. Food and Drug Administration Web site. Postmarketing safety of sildenafil citrate (Viagra): Summary of reports of death in Viagra users received from marketing (late March) through July 1998. Available at http:/www.fda.gov/cder/consumerinfo/viagraupdate721.htm. Accessed August 31, 1998.