Assertion: viagra | /r/HasAspect | half lives of about 4 hours
Facets:
Source sentences:
text: Both sildenafil and the metabolite have terminal half lives of about 4 hours.
text: Both sildenafil and the metabolite have terminal half lives of about 4 hours.
text: Both sildenafil and the metabolite have terminal half lives of about 4 hours.