16. Foxglove is a group of plants that can be very toxic if consumed, but are also used to make which medicinal drug?
From Quiz The Poisoner's Handbook
Answer:
Digitalis
There are about 20 species of Foxglove, all which look similar in appearance. They all have clusters of long bell-shaped flowers on a long stalk which are usually pink, purple, white or yellow in color. The plant is native to areas in Europe, Asia, and Africa. It is used to make the cardiac medication known as digitalis and when used in this capacity has saved thousands of lives. Each species has steroidal glycosides which can be physiologically toxic and leads to many of its nicknames such as "Dead Man's Bell" and "Witches Gloves". The entire plant is toxic and just a small amount can be fatal. Symptoms of ingestion include diarrhoea, nausea, vomiting, severe headaches, abdominal pains and hallucination. Later symptoms include slow and irregular pulse, tremors, convulsions,and vision disturbances. Most poisonings from this plant are accidental, but in 1999 six members of a Romany clan were put on trial for a crime that came to be known as "The Foxglove Murders". It has also been speculated in some circles that foxglove and/or digitalis was used to murder Pope John Paul I in 1978.