The U.S. Food and Drug Administration (FDA) has approved new label information for sildenafil (Viagra), tadalafil (Cialis), and vardenafil (Levitra) after reports of sudden vision loss attributed to nonarteritic ischemic optic neuropathy Although it is unclear whether the drugs caused the vision loss, the FDA advises patients to stop taking these medications and to seek medical attention if they have sudden or decreased vision loss or if they have ever had severe vision loss.

The new labeling information for each medication is provided on each FDA Web site:

• Sildenafil:http://www.fda.gov/cder/consumerinfo/Viagra/vIAGRA.htm

• Vardenafil:http://www.fda.gov/cder/drug/infopage/vardenafil/default.htm

• Tadalafil:http://www.fda.gov/cder/drug/infopage/cialis/default.htm.