For those navigating erectile dysfunction treatments like Cialis or Viagra, it's important to grasp how these medications function and why they might stop being effective: 🩸 Both Cialis and Viagra work by enhancing the effects of nitric oxide in the body. This is crucial because nitric oxide is essential for the relaxation of penis muscles, which allows blood to flow and enables an erection. ✅ The effectiveness of these medications heavily depends on the presence of nitric oxide. If your body's