The 1mcg in 2ml is the same strength as the 1mcg in 1ml. The 2ml is a slightly bigger ampoule as it has twice the liquid. (Saline) I think. I have used both and both you inject the whole ampoule in one go.
I have used these for about a year, because they were what I could get. I use 3ml syringes. I inject anywhere from twice daily to 3 times a week, depending on my symptoms and have never had any problems.
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