Hi & Welcome. There is no documented harmful interactions between Co-Amoxiclav or oral steroids with Reclast. Hence, these medications can be taken safely. The common side effects of Reclast intravenous infusion include flu-like symptoms (e.g., fever, chills, muscle/joint aches), dizziness, headache, or pain/redness/swelling at the injection site may occur. Most of these side effects are mild and occur within 3 days of treatment. Flu-like symptoms may be reduced by taking Paracetamol or Ibuprofen after the treatment. If any of these effects worsen or last more than 4 days you must consult your treating doctor. Hope these answer your query.