How do you make a toddler take medicine?

I have a cousin who hates to take any form of medicine. We've tried every sort, liquid, chewable, flavored, etc. To get him to actually swallow the medicine he is pinned down, his nose is held shut forcing him to open his mouth, and it is forced down. I'm afraid that this could emotionally harm him. Now he is terrified and cries, screams, hides, and even throughs up after taking it. He is about 3 years old, is there any way to convince him to take medicine willingly or atleast in a less painfull way?