What are the side effects of Ashwagandha (Withania somnifera)?

Ashwagandha may cause side effects including digestive issues (stomach upset, diarrhea, nausea), drowsiness, headaches, and dry mouth. Some people experience lowered blood pressure, which can be problematic for those already on blood pressure medications. Ashwagandha might increase thyroid hormone levels, potentially causing issues for people with thyroid conditions. It can also lower blood sugar levels, requiring careful monitoring for diabetics. Allergic reactions are possible, especially in those sensitive to plants in the nightshade family. Pregnant women should avoid ashwagandha as it may cause miscarriage. The herb can interact with medications including sedatives, thyroid medications, immunosuppressants, and blood thinners. Side effects are typically mild when taken at recommended doses (300-600mg daily of root extract) for short periods, but may increase with higher doses or prolonged use. If experiencing concerning symptoms while taking ashwagandha, discontinue use and consult a healthcare provider.