Cenforce 100 and Viagra both contain sildenafil citrate, a powerful PDE5 inhibitor used to treat erectile dysfunction (ED). While Viagra is the original brand by Pfizer, Cenforce 100 is a more affordable generic alternative. Both work similarly by increasing blood flow to the penis, helping men achieve and maintain an erection when sexually stimulated. The main differences lie in brand reputation, price, and availability. Viagra is widely trusted and FDA-approved, whereas Cenforce is popular for its cost-effectiveness. However, effectiveness and side effects can vary from person to person. Always consult a doctor to determine which is best suited for your health condition and needs.