I normally don't have any problems maintaining a erection I'm young and healthy, but a friend of mine told he uses Viagra for easy 4+ hour erections and he can keep going without stopping. He gave me some 100mg pills and I want to try one out. Has anyone tried them even though without a prescription to just maintain a hard long easy erection? I heard there no negative side effects to it even without prescription unless you suffer from some complications (which I don't).