The Food and Drug Administration has confirmed 39 deaths among American men using the popular impotence pill Viagra but says it remains convinced Viagra is safe when used by the proper patients.

The FDA updated Viagra information on its Internet site late Tuesday. The agency revealed that it also has received an additional 38 reports of possible deaths among Viagra users, but it has not been able to verify those reports' accuracy. Twenty-four were hearsay or media reports, eight failed to show whether the men actually took Viagra, and six involved foreign patients, the FDA said.Even the 39 verified reports, however, don't prove the drug was to blame, the FDA cautioned.