ibuprofen for fever how often
1 For higher fever, the dose usually is 10 mg per kg (about 4.5 mg per pound) of body weight. 2  The medicine may be given every six to eight hours, as needed, up to 40 mg per kg per day. 3  Infants younger than 6 months of ageâUse and dose must be determined by your doctor. 4  For menstrual cramps: