I have been taking 125mcg Eltroxin for some time and have felt very well, which was in sharp contrast to a few years ago when I was given Teva thyroxine.; my TSH shot up to 45 and I felt so unwell. After a month on Eltroxin my TSH returned to normal. Incidently, Teva had their licence revoked for the manufacture of thyroxine...I was informed that there was a problem with the incipients of the drug(the bulking out agent). Since Mercury Pharma stopped manufacturing Eltroxin tablets I was given a mix of medication from Wockhardt, Actavis and Goldshield and soon developed symptoms like fast heart/pulse and feeling like I was going to faint. I am at a loss as to why companies stop manufacturing tablets that people rely on. I have contacted Murcury Pharma and asked when they are going to resume manufacturing Eltroxin tablets and they just say they don't know. Maybe we should all look more closely at the insipients in thyroxine with different manufacturers because everyone's tolerance may be different and this can affect the absorption of thyroxine.