Fildena vs Viagra are both popular medications used to treat erectile dysfunction, with each containing Sildenafil Citrate as their active ingredient. While Viagra is the original brand developed by Pfizer and widely recognized worldwide, Fildena is a generic alternative manufactured in India, offering the same effectiveness at a more affordable price. Both drugs work similarly by enhancing blood flow to the penis, but Fildena often comes in a wider variety of strengths and forms, such as chewables and extra-strength versions.