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Children and infants can usually take ibuprofen every six to eight hours but should not have more than four doses in 24 hours unless directed by a doctor. If you are unsure about how much ibuprofen to give a child, consult a doctor who will determine the dosage based on the childâs weight.
Rating Newest Oldest. Best Answer: Ibuprofen is taken in 800 mg doses, three times a day for arthritis. A toxic dose depends on age, weight, and dosage. It's not a pleasant way to go, because of the tremendous range of side effects as the toxic effects takes place.