Sildenafil is typically taken on an empty stomach, as foods, especially ones high in fat, can delay the onset of action. Both ...

In conclusion, both sildenafil (Viagra) and vardenafil (Levitra) are highly effective treatments for erectile dysfunction. While they share the same underlying mechanism, they differ in minor but ...

Tadalafil Up to 36 hours 30-60 minutes As needed or daily Longer duration of action; less affected by food. Vardenafil 4-5 hours 30-60 minutes As needed before sexual activity Similar to sildenafil ...

This makes it a good choice for those who want a shorter onset of action and longer effect duration than sildenafil.