Patienter med alvorlige leversygdomme, alvorlig hypotension (meget lavt blodtryk) eller patienter, som for nylig har haft et myokardieinfarkt (hjertetilfælde), må ikke tage Revatio, da Revatio ikke er blevet undersøgt hos disse patienter.
Because Revatio has not been studied in patients with severe liver disease or severe hypotension (very low blood pressure), or who have recently had a stroke or myocardial infarction (heart attack), these patients should not take it.