Levaquin Side Effects: I've experienced a severe allergic reaction that resulted in over http://www.medications.com/effect/view/40463 I've experienced a severe allergic reaction that resulted in over 3 weeks of being in and out of the hospital for severe hives, breathing and digestion associated with severe reactions. I am now still hypersensitive with a low level case of hives. ARe t Don,t take any quinolones ever again. You had a severe reaction! Wed, 08 Apr 2009 21:54:50 -0400 http://www.medications.com/effect/view/40463?item=18723 Don,t take any quinolones ever again. You had a severe reaction! Go to floroquinolone toxicity research foundation to read more about toxic reactions caused by floroquinolones! I,m concerned that you STILL have hives after 3 weeks off drug! Not good. Re http://www.medications.com/effect/view/40463?item=18723