Found this interesting study by Pfizer with 163 participants Sildenafil (Viagra) For Meniere's Disease Sildenafil may alleviate the symptoms due to its vasodilatory activity. The purpose of this study is to assess the safety and efficacy of sildenafil (Viagra) compared with placebo on symptoms during one acute attack. Sildenafil For Meniere's Disease - Full Text View - ClinicalTrials.gov