Leaves, stems, raw and unripe berries, and other plant parts of the elder tree contain a toxic substance. If elderberry is not correctly prepared, it may cause nausea, vomiting, and severe diarrhea.
You shouldn't take more than the advised dosage.
If you are pregnant or breastfeeding, you should not use elderberry.
Elderberry may act as a diuretic. If you take medicines that increase urination, talk to your doctor before using elderberry.
There are no known food or medicine interactions linked with elderberry.