sildenafil citrate is found in penegra 100 mg tablets as a generic brand. It is used to treat erectile dysfunction in men. The effect of this drug lasts for 4 to 6 hours. And if the effect of this medicine is more than that, seek the help of a doctor immediately. Take this medicine only once a day. Do not use this medicine daily. If you want to buy good quality medicine then visit our site imediz.com.