My doctor is trying to prescribe Valtrex for my recurring Canker Sores, is this right?

That's strange but I was just discussing this last night with a nurse friend who has home bound patients and she said that one of her patients was taking Valtrex for canker sores. I have heard that canker sore are just a different form of ... I would just go to a different doctor and get a second opinion, if are really unsure and don't trust the doctor you are going to...