Here are few ways to find doctors that should be familiar with Naltrexone:
1) Suboxone Website -
www.suboxone.com Suboxane is a medicine used to treat opiate addiction and the medication is somewhat similar to Naltrexone so the doctors should know about naltrexone, or have an easier time understanding the medication when you bring it up. The suboxene website has a page where you can look up doctors by zip code.
2) The Coleman Institute -
http://www.thecolemaninstitute.com/locationsThis website has a list of doctors that should all be familiar with naltrexone
3) C3 Foundation -
http://www.cthreefoundation.org/find-a-physician.htmlThis website keeps a list of doctors familiar with Naltrexone - I don't know how regularly it's updated but it's definitely worth a shot
I live in Seattle and got my prescription through Dr. Mullen -
http://www.seattlewellnessprograms.com/She barely asked any questions and wrote my prescription for 5 months worth of refills.