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Prunella vulgaris is generally considered safe for people of all ages. However, the effects are not known for women who are pregnant or breastfeeding; thus, it is safest to avoid in those instances. Many of the effects of Prunella vulgaris have not been tested yet, so there may be effects not yet noted for this plant.
Drug interactions are not known at this time, but there are a few conditions that may have supposed drug interactions. Because of its effects on blood sugar, Prunella vulgaris should be used with caution for people with diabetes or those with low blood sugar as it may interfere with diabetes medications. Additionally, it may interact with herpes medications. Consult with a doctor first if you have either of these conditions before using Prunella vulgaris.
Minor side effects include dizziness, constipation, and general weakness and fatigue.
Tests conducted on rats and dogs confirm that Prunella vulgaris does not have toxic effects on the liver, kidneys, or other major organs. *