Breaking these large molecules into smaller components involves: 1  movement: propels food through the digestive system. 2  secretion: release of digestive juices in response to a specific stimulus. 3  digestion: breakdown of food into molecular components small enough to cross the plasma membrane.
Over-the-counter pain relievers, like Advil (ibuprofen), Aleve (naproxen sodium) and Tylenol (acetaminophen), are presumed to be safe. Since they don't require a prescription, directions and warnings aren't always taken seriously.
As with every medication, the time it takes effect depends on how fast it is absorbed by the body. With Advil, it usually takes effect within an hour after taking it and should last for at least 6 to 8 hours. So, you can time your taking it within these hours. Hope this helps.