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The only drug safe for pregnant women with serious thyroid disorders to take in the first trimester is no longer available in Canada, leaving doctors, medical organizations and the federal government scrambling to secure an alternative supply. The discontinuation of the drug, propylthiouracil, known commonly as PTU, poses a major risk to pregnant patients with hyperthyroidism – or an overactive thyroid – caused by Graves’ disease, said Lois Donovan, endocrinologist and clinical professor at the University of Calgary’s Cumming School of Medicine.
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