There has been a lot of discussion about a possible reformulation of Erfa, and the STTM website was one of the first to raise this possibility. Erfa has denied it, and claims that the only things that changed are the location of the production facility (moved from Belgium to Spain) and the production methods.
Yesterday, I mistakenly took pills (125 mg) from a 500 ct bottle that expired in March 2013. I had it next to the other bottle, looking exactly the same except for the label (it is pink and white on the more recent bottle, and blue and white on the newer bottle), and did not pay attention...anyway, yesterday, I felt better than in a long time. I was full of energy, yet calm and focused, and was willing to give Erfa another try. I was not even itching....last night, I discovered that I had taken the old pills (which apparently still work, even though they expired two years ago...). I also felt slightly hyperthyroid yesterday, which somewhat surprised me, since I have had to go from 6 grains on the "old" Erfa to 8 grains on the "new" one.
My conclusion is that something is different between these two versions, even though the company denies it. I was not sure whether to believe the STTM or not, but it seems something is different about the new pills. But would different production methods really affect the efficacy of the drug, if the active and inactive ingredients remain the same?!
I don't know if it would be any idea to try the smaller (30 and 60 mg) pills? Some say the contain other fillers and binders than the 125 mg pills. I chose the latter for purely financial reasons, but would be willing to switch if there is indeed a difference between the various pill sizes...if anyone else has noticed this, I'd love to know!