Guest guest Posted December 18, 2002 Report Share Posted December 18, 2002 Hi Grace, Beta blockers don't lower thyroid hormone levels the way ATDs do, but propranolol inhibits the conversion of T4 into T3. This can cause T4 levels to rise while T3 drops. I know they have known about the safety of beta blockers in pregnancy since at least 1988 since that's when I first started researching them. Take care, Elaine Quote Link to comment Share on other sites More sharing options...
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