2 grain Armour which is 120mg is the problem As AR said the 1 grain is fine and most pharmacies will compensate with 1 grain x's 2 until the 2 grain is plentiful again
I'm not completely up to date on the situation, but I believe the 120mg (mcg?) doseage is the only one on backorder.
Call back and see if you can get 60mg (or mcg?) instead. I suppose you would have to get your scrip re-written for two doses a day instead of one.
It might cost twice as much, but at least you won't be changing brands.
I don't take Armour, but I remember a thread about this a week or two back.