<s>[INST] hello, my 10 year old son has been running a fever above 100 the last 3 days now and i have been alternating back and forth from Motrin and Tylenol. He has been having diarrhea as well with cough and running nose. What else can i do. I took him ti urgent care and they tested him for strep and it came back negative. I am just concern about all this pain meds going into his body for so long. [/INST] Hi... Thank you for consulting in Chat Doctor. Fever of few days without any localizing signs could as well a viral illness. Usually rather than fever, what is more important is the activity of the child, in between 2 fever episodes on the same day. If the kid is active and playing around when there is no fever, it is probably viral illness and it doesn't require antibiotics at all. Once viral fever comes it will there for 4-7 days. So do not worry about duration if the kid is active. Paracetamol can be given in the dose of 15 mg/kg/dose (maximum ceiling dose of 500 mg) every 4-6th hourly that too only if fever is more than 100F. I suggest not using combination medicines for fever, especially with Paracetamol. Regards -  </s>