Yes, Zenegra 50 mg is a generic version of Viagra. Both Zenegra and Viagra contain the same active ingredient, sildenafil citrate, which belongs to a class of medications called phosphodiesterase type 5 (PDE5) inhibitors.

Sildenafil citrate works by inhibiting the enzyme phosphodiesterase type 5 (PDE5), which is responsible for the degradation of cyclic guanosine monophosphate (cGMP) in the smooth muscle cells of the penis. By inhibiting PDE5, sildenafil allows cGMP levels to increase, leading to smooth muscle relaxation and increased blood flow to the penis, which helps to produce and maintain an erection during sexual stimulation.

As a generic version of Viagra, Zenegra is generally more affordable than the brand-name medication. It is produced by pharmaceutical companies after the patent for Viagra has expired, allowing them to manufacture and sell sildenafil citrate under different brand names.

It's important to note that both Zenegra and Viagra are equally effective in treating erectile dysfunction when used as directed by a healthcare provider. However, because they are manufactured by different companies, there may be slight differences in inactive ingredients or formulation, but the active ingredient (sildenafil citrate) remains the same.