Another use for erectile dysfunction drug

LOS ANGELES, May 14 (UPI) -- U.S. researchers say drugs approved to treat erectile dysfunction may help treat brain tumors.

Researchers at Cedars-Sinai Medical Center in Los Angeles found the erectile dysfunction drugs sildenafil -- Viagra -- and vardenafil -- Levitra -- inhibited the enzyme phosphodiesterase 5 -- increasing the permeability of the blood-brain barrier.