I was took levaquin after a year off benzos, and it caused a mild flair up of symptoms. Muscle tremors and some nasty anxiety. Not pleasant, but nothing serious.
I think if you can take a substitute antibiotic, that is probably a good call. That said, you don't want to screw around with a bad infection. If your severally bronchial or septic, your dealing with illnesses that can be directly life treating. So be informed and make sure that the substitute is as effective and well indicated for your infection.
My 2 cents.
Best,
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