Levaquin (levofloxacin) is a prescription medicine that belongs to the group of drugs called fluoroquinolones. It can be used to treat a number of commonly diagnosed infections caused by bacteria. Cold and flu are viral infections and are therefore not supposed to be treated with the help of this medicine. There are some things you need to take into consideration before starting the treatment with this medicine. One of the serious risks associated with taking this medicine is tendinitis. This condition is developed by some patients and can be described as swelling of the tissue that connects muscles to the bones. If you think you have developed tendinitis let your doctor know about it.