Assertion: viagra's sildenafil | /r/ObjectUse | used with nitrate
Facets:
Source sentences:
text: Sildenafil can cause a serious drop in your blood pressure when used with nitrates.
text: Sildenafil can cause a serious drop in your blood pressure when used with nitrates.
text: Sildenafil can cause a serious drop in your blood pressure when used with nitrates.