1. something that is to happen or has happened to a particular person or thing; lot or fortune. 2. the predetermined, usu. inevitable, course of events. 3. the power or agency that determines the course of events.
Alternating between ibuprofen and acetaminophen every 2 hours because you have to wait 4 hours for each of them to take a second dose of the same thing. So instead you take a dose of Acetaminophen now, then Ibuprofen in 2 hours and back to Acetaminophen 2 hours later as needed.
If the ibuprofen is swallowed and then vomited up later, don't give your child another dose for at least 6 hours unless the dose was in tablet form and you can see that your child vomited up the whole tablet. Give every 6 to 8 hours as needed, but never give your child more than four doses in 24 hours.