Drinking ibuprofen does not reduce fever may be related to insufficient dosage of medication, taking medication for too short a period of time, and lack of water in the body. 1. not enough medicine: taking drugs need to follow the doctor’s advice, or in accordance with the instructions of the age of the requirements to take, if you take a smaller dose of drugs, can not achieve the therapeutic effect, will lead to drink ibuprofen does not reduce fever. 2. too short a time to take the drug: drink ibuprofen time is too short, the drug has not yet taken effect, usually half an hour to an hour after taking the drug, the drug will gradually take effect, the body temperature gradually decline, it is recommended to wait patiently. 3. lack of water in the body: if you don’t replenish water in time, you can’t sweat, the body heat can’t be dispersed, resulting in the body temperature can’t be lowered, resulting in drinking ibuprofen does not reduce the fever. If the condition is serious, it is also possible to drink ibuprofen does not reduce fever, it is recommended to go to the hospital in time for examination, to clarify the cause of the disease, and active treatment.