Defense Threat Reduction Agency. When DTRA employees arrive at work every morning, they are addressing the number one national security threat we face as a nation. The threat of WMD is a threat that can change everything about the way in which Americans live their lives. Our mission at the Defense Threat Reduction Agency (DTRA) â to safeguard the United States and its allies from weapons of mass destruction â is of paramount importance for the defense of our country.
Levitra is the brand name for vardenafil, an oral medication used to treat men who have sexual impotence, also known as erectile dysfunction or ED.It's part of a group of drugs known as phosphodiesterase-5 (PDE5) inhibitors.evitra increases venous congestion in that area and helps a man get and keep an erection during sexual intercourse. By itself, Levitra does not cause an erection-there must also be physical stimulation of the penis to achieve an erection.
Cialis, Levit ra, Staxyn, Stendra, and Viagra work by a similar mechanism to cause erections. There are subtle differences in how long the drug works and how quickly it works. Levitra works a little longer than Viagra. They both take effect in about 30 minutes.With Levitra, the effects last for about 5 hours. With Viagra, the effects last approximately 4 hours. Cialis works a bit faster (within about 15 minutes), and the effects last much longer -- up to 36 hours in some cases.here are subtle differences in how long the drug works and how quickly it works. Levitra works a little longer than Viagra. They both take effect in about 30 minutes. With Levitra, the effects last for about 5 hours. With Viagra, the effects last approximately 4 hours.