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.
Over-the-counter ibuprofen tablets contain 200 mg of medication, and this is generally safe to take up to three times per day. Higher doses can be prescribed if necessary but may increase your risk of side effects. The maximum daily dose for an adult is usually considered to be 800 mg three times per day.