Yes, you combine 500mg of acetaminophen and 150mg of ibuprofen. Ibuprofen only comes in 200mg pills, so if you want to be really spot on, take the liquid stuff for kids.
500mg is the max for ace a doctor is recommended to proscribe (on it's own). 150 is well below the max for ibu. Also I think you may have mixed up the grandparent commentator that stated they were a doctor and the parent that may be a doctor but hasn't made that claim here.
200mg is normal for ibuprofen, and prescriptions for 800mg versions are not unusual.
Meanwhile 500mg is, I believe, more than they combine with opiates and acetaminophen does lead to death via organ failure on the order of hundreds of people a year. I was curious why they weighted the acetaminophen proportionally so much higher than the ibuprofen.
