Viagara is on a list of over 85 drugs that can be affected by grapefruit leading to seriously negative side effects.
http://www.cbc.ca/news/health/story/2012/11/26/grapefruit-juice-drug-interactions.html
http://en.wikipedia.org/wiki/Grapefruit_drug_interactions
https://terb.cc/vbulletin/showthread.php?410480-Beware-of-grapefruit
http://www.cbc.ca/news/health/story/2012/11/26/grapefruit-juice-drug-interactions.html
http://en.wikipedia.org/wiki/Grapefruit_drug_interactions
https://terb.cc/vbulletin/showthread.php?410480-Beware-of-grapefruit




