Aldrin is a chlorinated organic insecticide whose use and manufacture has been banned in the U.S. (but not all other contries have followed suit). The chemical can poison via skin contact, ingestion or inhalation; symptoms include kidney damage, shaking, slurred speech, convulsions, respiratory failure, and death. Chronic exposure to non-lethal doses of aldrin can cause liver damage and probably cancer. There is no antidote to poisoning from this chemical; medical treatment is done to alleviate symptoms.
The information in this writeup was taken from the science dictionary at http://biotech.icmb.utexas.edu/; I oversaw the development of the dictionary (the website was mothballed in 1998) and I believe I wrote the entry this is based on.