Generally the discussions of safety and need for particular mediciations should be a team effort between your OB-Gyn and your Cardiologist. This way the risk and benefits of each can be discussed with regards to the specifics of your case.
Metoprolol is a pregnancy class C drug, meaning there are no adequate and well-controlled studies in pregnant women but animal studies have shown potential detriment.
Practically, beta-blockers may cause fetal bradycardia and possibly result in intrauterine growth retardation if used in the third trimester.
Any use of medications should be used with the guidance of your OBgyn and cardiologist.
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