I took Armour meds for many years and was my labs were all over the place. My endocrinologist changed my meds to Levoxyl. He expressed to me that I should never take Levothyroxine as its compound is as unpredictable as Armour. I have been taking Levoxyl for about 10 years and when I lost my insurance Levothyroxine was cheaper. I questioned a Nurse Practiticianor and the Pharmacist before switching. They both told me there was no difference. I was only on this med for 2 weeks and it thru my thyroid into a storm. I went right back to Levoxyl. There has been some media coverage regarding this lately. Levothyroxine appears to be compunded as unpredictable as Armour. I also am allergic to Synthroid, but I believe it is not a true allergy but a sensitivity to the binding compound. Please give Levoxyl a try.