There are many different numbers floating around, but let me give you a source that claims a 0.14–0.4% "prevalence of FQ-induced tendon injury". That's at least

There are many different numbers floating around, but let me give you a source that claims a 0.14–0.4% "prevalence of FQ-induced tendon injury". That's at least one in a thousand. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2921747 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2921747 They are also absolutely known and proven to cause permanent pain in the hand and feet (neuropathies) in some patients and "long lasting" anxiety, depression, hallucinations. Those are just a few of the serious long term side effects they can cause. Here is a good overview. https://www.mdpi.com/2673-4087/2/3/17 https://www.mdpi.com/2673-4087/2/3/17 Let me conclude that sometimes they are the right choice to save someone's life or prevent serious health consequences due to infection, but in the majority of cases there would be alternative antibiotics available.