http://www.medications.com/effect/view/30211 These posts about contacting a bad viral infection while the immune system is suppressed by Singulair are particularly worrisome. This was from 2007 so it has nothing to do with the FDA investigation. Epstein Barr causes some really bad illnesses includin Mon, 05 May 2008 22:09:35 -0400 http://www.medications.com/effect/view/30211?item=7968 WOW! I am so sorry! This is the first time you've told us about your health! This is horrible! I can now understand your thirst for knowledge about all of this and how it ruins lives - especially yours! I am sure you've been to tons of Doctors who od http://www.medications.com/effect/view/30211?item=7968 Tue, 06 May 2008 07:26:42 -0400 http://www.medications.com/effect/view/30211?item=7977 Sorry, I should have been more clear. Thank the lord, that this is not me. This is from another forum and a story about what can happen to the immune system. The leukotrienes are part our chemical defense against certain types of micro-organisms. A http://www.medications.com/effect/view/30211?item=7977