One on men with PE between 18 and 65, for instance, found that those who took sildenafil (the generic version of and an active ingredient in Viagra) were able to last slightly longer than those ...

However, PDE-5 inhibitors, including tadalafil, sildenafil, and vardenafil, commonly used off-label for PE, suffer from low bioavailability and systemic side effects like facial flushing ...