When a headache hits, it can bring an abrupt halt to your day. You reach for the bottle of Tylenol in your desk drawer, only to remember that your colleague took your last two caplets last week.

It works by lowering the activity of the immune system. Tylenol (acetaminophen) is a pain reliever commonly used to manage mild to moderate pain from headaches, muscle aches, menstrual periods ...

Most people who have sought pain relief are familiar with both aspirin and Tylenol, but there are important differences between the two. "With both aspirin and Tylenol, very frequently we think of ...