Britain’s competition watchdog is accusing a Canadian drug company of making tens of millions of dollars by overcharging the British healthcare system and exploiting its patients.

Until this year, Concordia International was the U.K.’s only provider of liothyronine, a thyroid drug that’s primarily used to treat a condition caused by a deficiency of thyroid hormone. For British patients, such as Felicity Hart who had her thyroid removed in 2010, the tablets are literally a life-saver.

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