We report the inadvertent administration of activated charcoal in water into the right lung and pleural cavity of a 51-year-old man being treated for a salicylate overdose. A mild chemical pneumonitis developed, as did a sterile empyema. Charcoal-stained fluid drained through a thoracostomy tube for 8 weeks. The patient was discharged in good condition but died 4 days later after taking another overdose. Direct administration of charcoal into the lungs is best prevented by radiographic confirmation of the location of the tube. Charcoal in water may cause less severe pulmonary injury than charcoal in sorbitol.