I was taking Synthroid then my insurance decided that they wouldn't cover that drug anymore (only generic) unless the doctor did a lot of paperwork and showed that it was medically necessary. She decided to prescribe the Levothyroxin instead, and I have heard and read that there is a difference and Synthroid is really the only drug that should be given. I have felt very fatigued and just not "right" lately, and think it is the change in drugs. Anyone else have any experience in switching between the two? If it's all in my head I don't want to complain to the doctor and make her jump thru hoops for the insurance company. I fear this is just the beginning of insurance companies denying coverage for expensive brand names.