Where have you been told this? Are you perhaps confusing acetaminophen for something else? Doctors will tell you that you can take ibuprofen and acetaminophen (paracetamol) together . It’s advised you wait an hour after you take one type before you take the other to see if the first medication works well enough. There are even medications sold as a combination of both. What you shouldn’t take ibuprofen along with other Non-steroidal anti-i inflammatory drugs (NSAIDs) like aspirin.