Assertion: viagra's use | /r/Causes | priapism
Facets:
value: in rare cases
type: TEMPORAL
Source sentences:
text: Also, in rare cases, vardenafil use may cause priapism, a very painful emergency condition that can cause impotence if left untreated.
text: Using Viagra can cause heart attacks; priapism, or a permanent erection, requiring medical attention; muscle aches or pain; bloody nose; diarrhea; difficulty breathing; headache; flushing or dilation of the blood vessels that causes the skin to appear very red; cold symptoms such as a runny or congested nose and sneezing.