KnowraSildenafilLinked fromLinked fromThe 6 pages that link to Sildenafil, each with the reason it gives.All 6Broader topic 3Related 1Compared with 2TadalafilCompared with: It shares tadalafil’s drug target but generally has a shorter duration of action.VardenafilCompared with: It is a close alternative with a longer clinical history and similar core mechanism.