I have a terrific PCP. He knew of naltrexone for addiction, but not low-dose, and his database showed only 8mg combined with another drug for weight loss. I briefly told him what I know and left him with a pdf from NIH, the gist of which was that LDN was somewhat efficacious against inflammatory diseases and easily tolerated. The latter is the big thing, as no doctor is likely to prescribe a dubious drug that might harm a patient. There is a link to that article somewhere in this forum. I also left him with my choice of compounding pharmacy and he faxed a prescription for 90 tablets of 4.5mg--$46 plus postage. Now that LDN is being used for long covid, more physicians may learn about it.