Poisoning by strong acids, alkalies, strong antiseptics including bichloride of mercury, carbolic acid (phenol), Lysol, cresol compounds, tincture of iodine, and arsenic compounds. These agents cause tissue damage similar to that caused by burns. If the substances have been swallowed, any part of the alimentary canal may be affected. Tissues involved are easily perforated. Death may result from shock or from asphyxiation caused by swelling of the throat and pharynx. Esophageal injury and stricture may be a late complication.