The chords pattern stays the same throughout the whole song. The C-D-C transition 
is actually a walk-down on the D sting that's played like this
E--------------|
B--------------|
G--------------|
D----5-4-2-0---|
A--------------|
E--------------|

                     G
So, I?m just the medicine
     C     D    C       G
You take when you?re sick
        C     D    C     G
You get well and that?s it
          C           Am            D
I?m put back on the shelf in your mirror

And it isn?t exceptional
The course of our fate
So, people love and they hate
And I guess it?s just our turn to hate

Yeah, you were just some song I wrote
A poem on a page
A sculpture I made out of clay
Desire was the flame

But now you?re more of a basketball
Boys just pass you around
They bounce you hard on the ground and dribble
And then we all get high fives

And you think I?m an asshole now
Well, you?re probably right
But at least I?m not blind to the facts
I?ve been wishing were lies

But still I hope you get everything
That you care to possess
And unbelievable sex with him
Or any one of my friends

But just don?t ask about my appetite
I didn?t lose it tonight
No, it?s been gone half my life
It?s just act, I?ve been eating for you