You are your own best advocate for managing your MG treatment and an important aspect of that is learning where to look for help. One essential resource is the FDA (The U S Food and Drug Administration).  Please refer to their website for updates and safety alerts at:

http://www.fda.gov/Safety/MedWatch/default.htm

Occasionally, the FDA may issue a label change on a medication. This is their February 2011 List that includes medications that may exacerbate Myasthenia Gravis:

Risk of fluoroquinolone-associated Myasthenia Gravis Exacerbation February 2011 Label Changes for Fluoroquinolones

http://www.fda.gov/Safety/MedWatch/SafetyInformation/ucm247115.htm

You may also visit the Levaquin (Levoflaxacin) website for complete details:

http://www.levaquin.com/

Always seek the advice of your physician or other qualified health care provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this website.