I found this topic interesting as I have hypothyroidism. I also got a nice letter in the mail from the FAA saying that I "did not qualify for a 1st class under part 67. (scared the crap out of me) Then the next line said that I did qualify under part 67 for a special issuance and the letter they sent had a new medical and a 6 year authorization for special issuance 1st class medical.....I'm still kinda bugged that I have to have a special issuance over taking synthroid.