THIS PRODUCT WORKS UP TO BETWEEN  12 TO 18 HOURS ON MOST PEOPLE

This medicine is a phosphodiesterase inhibitor used to treat sexual function problems such as impotence or erectile dysfunction. In combination with sexual stimulation, this medicine works by helping the blood flow into the penis to achieve and maintain an erection, normally works for up to 12 to 18 hours. This medicine is not intended for use in women or children. This medicine will not protect against sexually transmitted diseases including HIV infection. Use "safe sex" practices such as latex condoms