HI Thank for asking to HCM I really understand your concern, the acetaminophen is the only safe medicine for fever along with cold sponging, high grade fever is indication of something else rather than viral infection If I would be your daughter s doctor then I would certainly ask for routine investigation like complete blood count and of course urine analysis, the chances of urinary tract infection is more likely, now instead of bring the body temperature to normal it is time for diagnosis, brings down the temperature some time mask the clinical picture, have nice day