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Reassure him that people ingest small amounts of gasoline all the time, and are usually just fine.  Encourage the victim to take deep, calming breaths and relax. Small amounts of gasoline causes little harm once it reaches the stomach, but inhaling even a few drops of gasoline into the lungs can cause serious respiratory problems. Vomiting greatly increases the chances that a person will aspirate (inhale) gasoline into his lungs, and must be avoided. If the victim vomits spontaneously, help him to lean forward to prevent aspiration.  Have him rinse his mouth with water after vomiting and immediately contact Poison Control and Emergency Services. Encourage him to drink slowly to avoid coughing or choking.  If the victim is not conscious or able to drink on his own, do not try to administer fluids and call Emergency Services immediately.  Do not give the victim milk unless directed to do so by the Poison Control center, as milk can cause the body to absorb the gasoline more quickly.  Carbonated beverages should also be avoided, as they may make the burping worse. Avoid drinking alcohol for at least 24 hours. In the United States, the number is 1-800-222-1222.  If the victim is experiencing acute distress, including coughing, difficulty breathing, drowsiness, nausea, vomiting, or anything more severe, call Emergency Services right away. The victim should remove any clothing that came in contact with the gasoline. Set the clothing aside and rinse any affected skin with plain water for 2-3 minutes, then wash with mild soap.  Rinse the skin again thoroughly and dry. Gasoline and gasoline vapors are extremely flammable, and smoking could lead to a fire.  Cigarette smoke can also exacerbate any damage done to the victim's lungs by the gasoline. This could continue for as little as 24 hours to as long as several days.  Drinking extra fluids may help provide relief to the victim and help the gasoline pass through his system faster. If the victim starts to feel worse at any point, take him to the doctor for further evaluation. Gasoline-stained clothing poses a fire hazard, and should be left outside to air dry for at least 24 hours, giving the fumes a chance to evaporate before being laundered.  Wash the clothes separately from other clothing in hot water.  Adding ammonia or baking soda to the wash may help remove the gasoline.  Air dry the affected clothing to see if the gas smell is gone and repeat the washing process if needed. Do not put clothing that still smells like gasoline into a clothes dryer; it could combust!!
Stay with the victim and help him remain calm. Do not encourage the victim to try to vomit up the gasoline. Give the victim a glass of water or juice to drink after rinsing the mouth with water. Contact your local poison control center and explain the situation. Help the victim get any gasoline off of his skin. Make sure the victim does not smoke for at least 72 hours, and do not smoke around the victim. Reassure the victim that burping up gasoline fumes is normal. Launder any gasoline stained clothing.