Like "Same thing happens to me with my thyroid medications; doctor writes the script "as written" and Tricare keeps trying to get me something different, unproven on the market and it takes 8 - 10 weeks to determine if the drug is as effective. Fortunately, my pharmacy won't switch it like they want. Sorry you're having to go through this. As we age, we become more expensive and that is what happens unfortunately. And you're already on Medicare? God help me."