If Mytelase is an OLD drug...it was probably grandfathered into the FDA approval process. What the FDA does is go thru old drugs now, and require them to apply with new applications to show efficacy and safety. Guaifenesin for example and even levothyroxine had to go thru this process not to long ago.
When a drug doesn't have the consumer use base, to provide the incentive ($$$) drug companies drop the product instead of applying. The link to Canada and Australia suggests and FDA thing since they typically follow the FDA, here.
This sounds like a bummer for you. I certainly hope you find
what you need. I'd still call Sanofi to find where to go next. They might help you or tell you more.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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