I had a single pill of levofloxin about three years ago (for pneumonia). I woke up the next day, barely able to walk, with mass tendonopathy (tendon loss) in my arms and legs. I did the research and found out the dangers immediately, but one pill was enough to cause massive damage for me. My recovery took about ~2 years and was slow and challenging, but I'm now part of a facebook group where I see I'm one of the lucky ones. Many people have horrible symptoms and aren't recovering years out. New people join daily.