First, to the commentators who are saying medicine isn't supposed to taste "good" but is supposed to work, I think you missed the part of the letter where the OP said her child hates the taste of bananas. It's hard enough getting a child to down icky tasting medicine and it only adds insult to injury when it comes flavored with something you hate.

Second, if manufacturers can make medicine that tastes better than "medicine", why not take advantage of it? Personally, I'm thrilled I can get medicine for my kid in different flavors. Progress rules!

Third, I agree with the OP's letter, and I think her solutions for the pharmacy to make it right were reasonable. While I realize they wouldn't want to take the hit on taking back medication they couldn't resell, it was still their mistake. What if they had given her the wrong actual medicine? Would their resolution of "too bad" still be acceptable?

And as for the flavoring, if I had paid an extra $3 for it (which I think is ridiculous), you darn well better believe I'd expect to get what I paid for.