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Sildenafil adjunctive therapy to risperidone in the treatment of the negative symptoms of schizophrenia: a double-blind randomized placebo-controlled trial.
Akhondzadeh S, Ghayyoumi R, Rezaei F, Salehi B, Modabbernia AH, Maroufi A, Esfandiari GR, Naderi M, Ghebleh F, Tabrizi M, Rezazadeh SA. Akhondzadeh S, et al. Among authors: tabrizi m. Psychopharmacology (Berl). 2011 Feb;213(4):809-15. doi: 10.1007/s00213-010-2044-z. Epub 2010 Oct 15. Psychopharmacology (Berl). 2011. PMID: 20949350 Clinical Trial.
308 results