Does anyone have experience of taking TEVA T3 liothyronine 20 mcg? I was taking Mercury Pharma Concordia brand quite happily for 18 months and was then supplied with TEVA brand (for last 6 weeks) which i do not seem to be getting on so well with - i feel more tired and achy on this. Id like to know if anyone else has a similar issue? I have used the yellow card system to report my concern - but it might be just me. Im going to try and gain a prescription for a named brand - but i know I might have difficulty getting this. I realise I am so lucky to be prescribed T3 at all!