WORMWOOD
Wormwood is relatively safe for short-term use (two to four weeks). Long-term (4 or more weeks) and/or taking higher amounts than recommended can cause serious side effects such as insomnia, vomiting, nausea, vertigo, hallucinations, restlessness and seizures.

Because wormwood contains compounds that can produce toxic effects, people with the following conditions should avoid taking wormwood: 

Pregnant or breastfeeding: Wormwood may cause a miscarriage.
Epilepsy or another seizure disorder: Wormwood contains thujone—a chemical that is known to cause seizures. Wormwood may also reduce the effectiveness of some anti-seizure medications.
Heart disease: If you are taking warfarin for cardiac health, wormwood may cause intestinal bleeding.
Kidney disease: Wormwood is toxic to the kidneys and may lead to kidney failure
Allergies: If you are allergic to the Asteraceae family (e.g., ragweed, marigolds), avoid wormwood, as it is in this botanical family.