The correct ibuprofen dosage for a 91-pound child is 300 milligrams every six to eight hours, states BabyCenter. Children should take no more than four doses of ibuprofen in a 24-hour time period.
Because ibuprofen is sold in many forms, it's best to verify the concentration or dose of the product being used before giving it to a child, explains BabyCenter. When measuring liquid ibuprofen, individuals need to use the measuring device provided with the medication.
Ibuprofen is a nonsteroidal anti-inflammatory drug, or NSAID, that is commonly used to reduce fever and relieve pain, notes MedlinePlus. This medication sometimes causes side effects, including constipation, diarrhea, dizziness, nervousness or ringing in the ears.