<s>[INST] my grandson has been running a temperature in the range of 102 to 103.7 since Tuesday. He s seen the doctor 3 times who believes the reason for his elevated temperature is viral. I am alternating between tylenol and motrin as per doctor s advice. I am concerned about what the tylenol may do to his liver and the motrin to his digestive system....your comments please [/INST] Tyelenol(PCM) and ibuprofen causes diarrhea, gastric upset and even nausea, vomiting. Higher doses given for longer duration can cause hepatic dysfunction. Tyelenol can be given at a dose of 15 mg/kg/dose 4-6 hourly. Along with giving medications, try doing tepid sponging of the children body with cold water to reduce the fever. Gastric symptoms are transient and will resolve spontaneously. Worry more about his high grade fever rather than the side effects of these Chat Doctor. Thanks </s>