In current practice, PDE5 inhibitors are the most commonly used treatment for ED. This drug class consists of sildenafil [Viagra®], vardenafil [Levitra®], tadalafil [Cialis®], and avanafil [Stendra®]. Sildenafil was the first in this series of PDE inhibitors.
For more on the treatment of ED, read here.
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Cite this: Fast Five Quiz: How Much Do You Know About Erectile Dysfunction? - Medscape - Jun 18, 2015.