<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have an open wound on my arm, and its really painful. What medication do I need to take?  <response>: You will need to take Lidocaine to reduce the pain. But, you will also need to take Cephalexin to prevent any infections from the wound. In addition, you will need a Tetanus Toxoid Vaccine Adacel to protect you from tetanus, and Bacitracin Septa to apply on the wound to prevent any bacteria from getting inside. You can also use Povidone Iodine Topical Betadine or Chlorhexidine Topical for antiseptic purposes. Finally, you may also need Cefazolin or Cefadroxil depending on the severity of the wound. 