that is a safe dose but you may not be taking enough. the maximum dose of ibuprofen is really 3200 mg and you are taking 400 mg. since i don't know your medical history or your weight so you can address you dosage with your doctor. medically you may be able to increase your dose to 600 mg each time; up to 3 or 4 times per day if your arthritis warrants it.
how much ibuprofen is safe to take each day it helps with my arthritis pain! . i'm taking two 200mg of ibuprofen each day. thanks!