Has anyone ever taken the antibiotic Levofloxcin? My doc prescribed for me for sinus/bronchitis but it says not to take if you've ever had a heart attack, that one of the side effects is messing up the rhythm of the heart (QT prolonged something or other), and family history of sudden death (that's me). We don't have the QT problem but since I'm not running a fever anymore and feel "on the mend" I am inclined not to take something with so many "possible" serious side effects. Yesterday I had a 99 and 100° fever, but none at the doc's office. Chest was clear as was sinuses, but doc said I may have secondary infection after having a severe sore throat all week & cold (sore throat gone). What antibiotic is safe for use in heart patients?