The active component of Cenforce 200 vs viagra tablets, sildenafil, acts by boosting blood flow to the penis. The symbol for it is PDE5-inhibitor. Men who take it can have an erection for up to 30 minutes. In certain situations, an erection can endure for up to four hours. Depending on how well you're doing right now. This medication is prescribed to those suffering from erectile dysfunction, or impotence in men. Keeping or maintaining an erection is also aided by it.