American ginseng has different medicinal effects from the Siberian and Asian varieties.
Here's what MedlinePlus says about American ginseng:
- Side effects may include diarrhea, itching, insomnia, headache, and nervousness.
- Never take ginseng if taking warfarin (Coumadin).
- Use caution if taking ginseng with MAOIs, antidiabetes drugs or immunosuppressants.
- Do not take ginseng if you are pregnant.