>>29718731If your erection lasts 4 hours or more, you need emergency medical care or your penis may be permanently damaged. The normal erectile function of the penis is disrupted by viagra, and if you're still a relatively young man (which I'm assuming you are), then that's an additional factor leading to a longer erection.
It's generally not advised for young men to use viagra as a 'sex aid' to improve their endurance.
