Fluoroquinolones are molecularly designed to destroy most cells in the human body, so it's unclear why some people are affected more than others. Two things to

Fluoroquinolones are molecularly designed to destroy most cells in the human body, so it's unclear why some people are affected more than others. Two things to consider: Fluoroquinolone side effects can be so outrageous that people don't know to look for them or link them to antibiotics. For example, sensitivity to light, increased anxiety or depression, unexplained tendinopathy or random stabbing pains around the body, weakness or instability in joints, unexplained dizziness, heart palpitations, are some of the dozens of possible "milder" symptoms. Secondly, the delayed toxicity of fluoroquinolone antibiotics can cause permanent damage years after stopping the drug. Anecdotally a story just surfaced of a woman with a spontaneous tendon rupture 7 years after stopping cipro. Something like permanent mitochondrial damage, or delayed genetic damage, or delayed oxidative stress, which fluoroquinolones are well documented to cause, may weaken the body slowly over time.