When people ask for the "best ED medicine," they're almost always asking about PDE5 inhibitors, and for good reason — they're the most studied, most effective first-line ED medications. The two you'll encounter most:
- Sildenafil (the active ingredient in Viagra) — short-acting, typically taken before activity, effective for a window of a few hours.
- Tadalafil (the active ingredient in Cialis) — long-acting, with an effect that can last well over a day, and available in a low daily dose some men prefer.
Both are now widely available as affordable generics. There's no universal "best" between them — sildenafil suits men who want to dose as needed, while tadalafil suits those who prefer spontaneity or a daily routine.