How It Actually Works (The Mechanic's Version)
Forget the complicated science. An erection is just a matter of hydraulics. Blood has to get in, and it has to stay in. When you get turned on, your body sends out a signal that tells the flexible pipes (your blood vessels) in your penis to chill out and expand. This allows blood to flood the area, creating the firmness you're after. Simple enough.
But your body has a built-in "cleanup crew" enzyme called PDE5. Its job is to get rid of the "relax" signal, so your blood vessels tighten up again and the blood flows out. In guys with ED, this PDE5 enzyme is often overzealous. It's like a cleanup crew that starts mopping the floor in the middle of the party. It kills the vibe too soon.
This is where Sildenafil Citrate earns its paycheck. It's a "PDE5 inhibitor." Its only job is to find that overeager PDE5 enzyme and tell it to take a coffee break. By putting the cleanup crew on hold, Sildenafil lets the "party" signal stick around longer. So when you're aroused, blood flows in and, more importantly, it stays there. It doesn't create the party; it just stops the one guy who's trying to shut it down. This is true for both Cenforce 100 and the more potent Cenforce 200.