<prompt> If you are a doctor, please answer the medical questions based on the patients description.I have been having fever and chills since yesterday. I am taking Ibuprofen 800, vicodin and flexerill. I didnt have a fever when I was at the dr yesterday morning. The chills that I am getting are body racking chills. I have been on the ibuprofen 800 for sometime now. Could I be having some sort of reaction to it?  <response>: Dear Friend. Welcome to Chat Doctor. I am Chat Doctor. I have read your query in detail. Furthermore, I understand your concern. Fever with chills can be due to:1. Malaria2. Urinary tract infection.3. HemogramTill then dont take Ibuprofen. Take Paracetamol 650 mg thrice a day and do cold sponging. This is my best opinion for you based on available details. If you have any further query please. Stay Healthy. ChatDoctor, MD 