I remember reading somewhere in the forum that beta blockers decrease T4 to T3 conversion. Does anyone know if they can also affect the way your body handles direct T3?
I was on Thiroyd from Thailand in the summer of 2012, felt really good on 5 grains daily, and this was confirmed by labs (above mid-range FT4 levels, FT3 levels at the top of range). A year later, I was put on beta blockers (Tenormin) along with blood pressure medication. Looking back, I realise I have not felt as good since. In February of this year, after almost three years on beta blockers, both my FTs were at the bottom of range on 5 grains of Thiroyd. I then realised my returning hypo symptoms coincided with the drop in my free Ts. I switched to Thyroid-S as some claim it's more potent, but I seem to require a minimum of 8 grains daily to function.
Has anyone else experienced this on beta blockers? If indeed they do decrease T4 to T3 conversion, I can understand that would be a problem for someone on T4 drugs only, but NDT no longer seems to be working the way it did...and it contains a lot of direct T3 which logically should not have anything to do with decreased T4 to T3 conversion. I read a post here recently claiming NDT no longer contains porcine thyroid, and that most people seemed to experience a change for the worse around the time there was a shortage of pigs (due to swine fever or something like that?) a few years ago. It is sometimes said that NDT pills are supposed to stink, but mine have no smell at all...and I have tried several brands: Armour, Erfa, Thiroyd, Thyroid-S...all smell free.