Fast tracked? You can use the medication NOW.
You don't need FDA approval for use of medication in a different population than what was originally intended.
Zithromax is used in CF even though it's labeling specifically says it shouldn't be used in CF.
Colistin doesn't have a label for nebbed use in CF, but the CF community uses it anyway.
It's called using a medication "off-label." And off-label Avandia use isn't any different.
You could start using it tomorrow.