Assertion: viagra's use | /r/HasProperty | eg
Facets:
Source sentences:
text: Hypersensitivity to sildenafil or any component of the formulation; concurrent use (regularly/intermittently) of organic nitrates in any form (eg, nitroglycerin, isosorbide dinitrate); concomitant use of riociguat (a guanylate cyclase stimulator).