Care of persons exposed to toxic chemicals must be directed by a physician or other recognized authority. Avoid sources of heat including fire. Malononitrile will liberate highly toxic cyanide fumes when heated to decomposition or may react violently on prolonged heating. Extremely toxic by all routes of exposure. Malononitrile may be fatal if inhaled, swallowed, or absorbed through skin or mucous membranes.
Caution is advised.
Cherry-red or bloody mucous membranes may be noted. Cardiac arrhythmias and other cardiac abnormalities are common. Other symptoms include anxiety, confusion, tightness in the chest, and involuntary urination and defecation. Lung hemorrhage and pulmonary edema may also occur. Malononitrile is irritating to the skin, eyes, and mucous membranes.