Sildenafil (Viagra®) down regulates cytokines and prevents demyelination in a cuprizone-induced MS mouse model. de Nunes A K S, Rapôso C, de Luna R L A, da Cruz-Höfling M A, Peixoto C A Cytokine. 2012 Jun 30. PMID: 22749439. Abstract CommentRecommendBookmarkWatch