Thank you for your question. Lisinopril is an ACE inhibitor class of medication used to treat hypertension. It is contraindicated during pregnancy as it can been shown to cause fetal death and birth defects. Since you have only taken one dose and you have recently started your second second trimester of pregnancy, we recommend that you report this mistake to your ob/gyn. It is possible that a single dose of this medication will not pose any danger to your pregnancy however we would like you to ere on the side of caution. Your ob/gyn will determine the next appropriate steps based on your current pregnancy and risk factors.
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