I read that you can use up to 3 patches for pain. My father has been using Lidoderm patch for years for post neuralgic shingle pain. We tried the 3 patches for two 12 hour periods. I now feel he has developed symptoms from the 3 patches. Depressed, anxious, worried, dizzy and tired. I was wondering if anyone knows how long after discontinued use, these symptoms will last. I don't advise using the 3 patches. It really worked for his pain, but we are defiinatley going back to only one patch.