Taking an NSAID while you take levofloxacin or other fluoroquinolones may increase your risk of central nervous system effects and seizures. theophylline (Theo-24??*, Elixophyllin??*, Theochron??*, Uniphyl??*, Theolair??*) a medicine to control your heart rate or rhythm (antiarrhythmics) Ask your healthcare provider if you are not sure if any of your medicines are listed above.