A substance that, when introduced into the body in relatively small quantities, causes destruction or malfunction of some tissues and organs. Depending on the quantity in the body (the dose), a poison can kill. The word poison usually implies that a substance has no healthful use and is to be considered dangerous even in small quantities. Most common household substances are poisonous, including bleach, ammonia, drain cleaners, paint supplies, and so on.

Substances Causing Deaths from Accidental Poisoning

Drugs

Analgesics and antipyretics Sedatives and hypnotics Tranquilizers Antidepressants Other psychotropic agents Other drugs acting on nervous system Antibiotics and other antimicrobial agents Cardiovascular drugs Hormones Hematological agents Other drugs

Other Substances

Alcohols Cleaning and polishing agents and paint Petroleum products Pesticides Corrosives and caustics

Gases

Utility gas Carbon monoxide Nitrogen oxides Freon Other gases

In the practice of medicine, many useful DRUGS, such as antibiotics for treating infections or...