I took Synthroid for 10 years. I then switched to Levothyroxine because insurance wouldn't cover my Synthroid. I was on Levothyroxine for 8 years and it was the worse years of my life. The bad thing is I went to all kinds of doctors and specialists no one could figure out what was wrong. I finally researched the medications. I asked my doctor to put me back on Synthroid and I have felt good ever since I changed. Not only that, when I compared the two, I
opened the Levothyroxine bottle and you could SMELL the strong chemical aroma. I
opened my new bottle of Synthroid, NO SMELL at all! Good luck, hope you feel better!