Is the lidocaine patch safe?
The lidocaine patch is the safest prescription treatment currently used for PHN. Because lidocaine does not get into the blood in any significant amount, there are no severe side effects. The patch is safer than the pills used to relieve pain, because the medicine goes directly to the painful area, not through the whole body. The most common side effect (which is not very common) is redness or swelling of the skin around the patch.