I'm not on Armour. I'm on Thyrolar, which is similar, but synthetic. But I went through this with some medication for PCOS when it became available in generic form. It was not fun!
When you buy a generic drug from a pharmacy, it can be manufactured by any company. They can all follow high quality control standards, but you're not always going to get the same manufacturer every time. You will get the same drug - but maybe there are fillers in one brand that are different, or other subtle differences.
For most drugs, this is not a problem. For Metformin, this was a HUGE problem for me and many other patients. Once I got my doc to specify the brand name Metformin, I did much better. Since PCOS and thyroid disease are both endocrine disorders, my guess is that thyroid patients would have BIG problems with generic versions also.
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