Are there fillers in generic that don't exist in Synthroid?

[Schreck985]

I've been on Synthroid for about six-plus years.  When finally diagnosed as hypo, my previous doctor said he wasn't even going to bother with generic because it doesn't work and put me on Synthroid.  I knew my mother had issues with generic not working, so I wasn't going that route anyway.
I've always insisted on name brand, but have had a doctor accidentally write a script for generic once before and it didn't work.  In December, after years of looking at my blood work in my patient portal and questioning why certain numbers came back high and certain came back low; however, my doctors didn't seem to care, I insisted on another test, in which the numbers came back high again.  At this same visit, we determined I have a gluten sensitivity and I went on a gluten free diet.  My stomach pain went away and so did my joint pain.  When my blood work came back, the doctor recommended I up my dose from .25 mcg to .50 mcg, but since I still had a bottle of Synthroid, I just took two a day until they were all.  When I picked up my new prescription from the pharmacy and brought it home, I realized they'd filled it with generic.  I figured I'd give it a try.  After a few days, the stomach pain came back in spades and it took me a week or so to realize the timing coincided with switching to generic.
Has anyone else had these experiences with switching?  I've read there are reactions to fillers with some people but Mylan (I read) supposedly can verify that they are gluten free.
I must add, my body reacts the exact opposite to nearly any medication as it should.  For example, muscle relaxers and Nyquil make me wired.  This entire situation is hereditary apparently, as my mother suffers the same.  

[Barb135]

Yes, different manufacturers use different fillers/binders in their pills than the manufacturer of Synthroid... Every manufacturer is different; they also use different dyes and we've had some members that have reactions to the dyes.  We've had a few that have had to take the 50 mcg pills (from all manufacturers), which are white (no dye).  

Other than fillers/binders, generics work just as well as name brands for most.  You might think about trying Levoxyl, which is another name brand, but is somewhat less expensive than Synthroid.  Everyone I've know to be on Levoxyl has done well on it.