Should i use a cannabis topical or oral treatment for postherpetic neuralgia?

Yes, CBD is very effective for all neuropathy and can be used topically and orally. The dose is different for each person so after starting with CBD increase quickly to find an effective dose for you. A target dose for the average person is 60mg but you may need more. CBD will at least reduce any need for other medications. My patients usually see reduction in opioid use by over 75%.