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5. Phosphodiesterase type 5 (PDE5) inhibitors [sildenafil citrate (marketed as Viagra and Revatio), vardenafil hydrochloride (marketed as Levitra), and tadalafil (marketed as Cialis)]: Sudden Hearing Loss. [online]. Food and Drug Administration (FDA) [Acessado em 06 de junho de 2013]. Disponível em: http://www.fda.gov/Drugs/DrugSafety/DrugSafetyNewsletter/ucm119034.htm#pde5