Penegra tablets are is as effective as Generic Viagra that helps in treating erectile dysfunction amongst men. ED or impotence refers to the failure in achieving and maintaining erection when a man is sexually stimulated. It is an oral therapy that is constituted with Sildenafil Citrate, the basic ingredient of Viagra. This chemical is FDA approved and extremely safe to consume. These 100mg pills are effective in similar manner as the branded versions of Viagra, what differs is the cost.