Assertion: viagra's side effect | /r/HasProperty | nasal congestion
Facets:
Source sentences:
text: Other side effects include: epistaxis, insomnia, nasal congestion, and rhinitis.
text: Possible side effects include flushing, nasal congestion, headache, visual changes, backache and stomach upset.
text: Common side effects of the drug include headache, facial flushing, indigestion, nasal congestion, and a blue tint to the vision.