Is it safe to take simvastatin while breastfeeding?

No. Simvistatin, the generic name for zocor, (simvastatin) is one of a class of drugs called "statins" which are used to lower cholesterol, and, specifically, ldl. It is strongly recommended to stop using this class of medication during pregnancy and nursing.
Yes & no. This medication group is considered toxic in pregnancy due to interference with fat metabolism in the fetus. During breast feeding, so much is protein bound (98%) that little is able to transfer to the milk. It does make it into animal milk, but no human studies are available. Most recommend avoiding this med unless the need is greater that the marginal risk involved.

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Is it safe to take vytorin (ezetimibe and simvastatin) while pregnant or breastfeeding?

No when nursing. Because of a concern with disruption of infant lipid metabolism, any cholesterol-lowering drugs are best not used during breastfeeding. An alternate drug is preferred, especially while nursing a newborn or preterm infant. Read more...