Hello, As the question is about the tendonitis caused by ciprofloxacin let me put my comments here. As Ciprofloxacin cannot lead to tendonitis, so be assured that the drug has not given any side effects which may lead to tendonitis, and that was the reason doctors have not offered anything for tendonitis. Muscle pain, tendon pain, anxiety, depression cannot be caused by ciprofloxacin. The major side effects it can cause it - nausea, vomiting, dizziness, rashes, diarrhea, stomach upset etc. It might be something else, so figure out this we need some part of the past medical history. Also, you can observe the symptoms for 2-3 days and give him paracetamol as a supplement, if the symptoms subside it won t be a drug reaction. In case after 3-4 days the symptoms still persist, then I think you need to get the blood routine. Also, anxiety and depression are common in kids as they cannot bear the pain and they actually don t understand what they are going through. So this can be psychological. My advice will be to wait for 2-3 days and keep the kid happy by diverting his mind by either foody stuff or toys. I think he should be fine and this is surely not a drug reaction. Hope I have answered your query. Let me know if I can assist you further. Take care Regards, Jay Indravadan Patel, Physical Therapist or Physiotherapist