isosorbide mononitrate

What Drug Must Not Be Prescribed When A Patient Is On Isosorbide Mononitrate? What drug must not be prescribed when a patient is on isosorbide mononitrate? Do not take riociguat (Adempas®), sildenafil (Viagra®), tadalafil (Cialis®), or vardenafil (Levitra®) while you are using this medicine. Using these medicines together may lower your blood pressure and cause