In principle, there is no fastest way to reduce fever in adults. Physical therapy or medication can be chosen according to the temperature of the fever. 1. Physical therapy: adults with fever not higher than 38.5 ℃, can be through physical therapy to reduce fever, such as in the armpits, groin and other parts of the ice to cool down, but also warm bath. In addition, you can drink more warm water, eat a light diet, pay attention to appropriate exercise, etc., are conducive to alleviate the symptoms. 2. Medication: adults with body temperature higher than 38.5 ℃, when there are obvious fever symptoms, you can take oral antipyretic drugs, such as acetaminophen, ibuprofen, nimesulide and other drugs, the use of medication need to comply with medical advice. Adults do not try to use drugs indiscriminately when the fever, too much medication will have other side effects on the body, when the condition is serious, it is recommended to go to the hospital to improve the examination of the cause of treatment.