How do Medicines Work?

I've always taken medicines for granted, not knowing how they actually work.  I was just researching online because this came up in mind to me, how I never understood how medicines actually work.

Medicines work in a variety of different ways.  The more common ones we take are used to: relieve pain, fight infection, fight diseases, and supplement a deficiency.  But how exactly do the medicines do these jobs?

Well, it all starts off by knowing what happens to the medicine when it enters your body.  There are four main parts to how medicines are processed by your body.  These include administration, delivery, performance, and elimination.

In order for all medicines to work, the must be absorbed into the blood. The most common type of medicine, an oral pill, goes into the stomach and then reaches the small intestine.  These medicines are then absorbed in the small intestine into the blood stream.  So basically, almost all medicines get absorbed into the bloodstream from the small intestine, or they are just injected directly into the bloodstream.

The full article can be found here.