Introduction Choosing between Sildenafil (Viagra) and Tadalafil (Cialis) can be confusing—especially if you're new to ED medications. Both are popular, effective, and FDA-approved, but they differ in how fast they work, how long they last, and how they fit into your lifestyle. In this 2025 guide, we break down the differences between Sildenafil and Tadalafil so you can...