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.
Jim Scott. Re: Bad stomach ache after taking advil. I'm not a doctor but I've read that one shouldn't ingest more than 1200 milligrams a day of any NSAID OTC drug such as ibuprofen (Advil) and that you should stop taking it at all if stomach pain persists.