Overexposure can cause unconsciousness, liver and kidney damage and death.
Lower exposures can cause dizziness and drowsiness.
Long term exposures can cause chronic damage of the liver, kidneys, blood forming organs and nerves. Liquid or vapor can cause eye damage. It is used in making other chemicals, insecticides, paints, rust removers and varnishes. Definitions are attached. Exposure to hazardous substances should be routinely evaluated.