I have to take a letter to my GP from the oncologist at the hospital where I have been treated for my thyroid cancer and it just says I need Thyroxine tablets 75mcg. The hospital gave me 28 days supply but they are the generic ones. One is for 50mcg made by Actavis and the other is 25mcg by Wockhardt. If I can get the branded version I would rather do so especially as I know that the generic metformin I was given by my chemist does not work for me. I managed to get my GP to change me back to the branded metformin and my blood sugars are now improving. I am also concerned that 2 different manufacturers will make their own formula slightly differently and perhaps they may interact with each other. I've been on the generic ones for 2 weeks now and I am not experiencing any improvements in my symptoms, I'm now hypothyroid following removal of the right lobe of my thyroid.