Thank you for your letter regarding your concerns about fluoroquinolone toxicity.  I appreciate your taking the time to bring your concerns to my attention.  I have contacted the Food and Drug Administration on your behalf and have brought the information you presented to the attention of the appropriate officials.  I have requested a review of this matter and a written response from their office.  As soon as I have something to report, I will contact you again.  In the meantime, if you feel I can be of assistance in any other way, please let me know.