whether levothyroxine products (Synthroid, Eltroxin) are interchangeable

There's debate over whether levothyroxine products (Synthroid, Eltroxin) are interchangeable.

Some provinces already don't allow levothyroxine products to be interchanged...but there is no federal ruling.

Product monographs of levothyroxine include warnings to discourage interchangeability...because brands are not considered equivalent in content or bioavailability.

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