What Are The Uses And Side Effects Of Levaquin 500 Mg?

My wife was given Levaquin for a respiratory problem. Since then she has experienced extreme pain in her knees and now she is experiencing shortness of breath, dizziness, her heart pounds and she gets weak. the school nurse thinks she has a enlarged heart. She has an appointment with a cardiologist in 10 days. Could this have been caused by Levaquin and assuming she does have an enlarged heart caused by it, what treatment options are there?