Levaquin Side Effects: I've been taking Levaquin for 7 days for a bad sinus infection. L http://www.medications.com/effect/view/39770 I've been taking Levaquin for 7 days for a bad sinus infection. Last night I took the last pill. It worked very well, within 1 day my sinus infection felt a lot better. However it gave me severe stomach cramps, and it caused constipation and insomnia. And t Find if your side effects are matching with yours at http://www Tue, 10 Mar 2009 07:35:55 -0400 http://www.medications.com/effect/view/39770?item=17842 Find if your side effects are matching with yours at http://www.internationaldrugmart.com/levaquin.html http://www.medications.com/effect/view/39770?item=17842 but it is the damage it has already done that most people are dea Mon, 20 Apr 2009 23:50:44 -0400 http://www.medications.com/effect/view/39770?item=19046 but it is the damage it has already done that most people are dealing with, not the drug... the drug comes in, does its destruction, and probably leaves at that point. that is what my doctor told me. http://www.medications.com/effect/view/39770?item=19046