Vardenafil typically starts working faster, around 15 to 30 minutes after ingestion, while sildenafil may take 30 to 60 ...

Although Cialis and Viagra both make it easier to get and maintain pleasure, there are a few key differences between ... such as tadalafil (the active ingredient in Cialis) and sildenafil (the ...

Studies of selective phosphodiesterase type 5 inhibitors (sildenafil [Viagra], vardenafil [Levitra], and tadalafil [Cialis ... and clinically significant difference. Only 28% of sildenafil ...