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.
Answer   The half-life of ibuprofen is approximately 2 hours. This means that after 2 hours, only half of the active dose is still present in your system. After â¦ 6 hours (3 half-lives) there's 1/8th left of the original dose in your system, which is not enough to perceive any effects. After one day (12 half-lives) there's only 1/4096th left, or practically none. + 118 others found this useful.