Seroquel is a fairly powerful antipsychotic used for the treatment of psychotic disorders and schizophrenia.
While looking in the "The Pill Book 10th Edition", it looks like this drug can have MANY side effects (literally taking a page and a half to name them all) which is A LOT for this book!
I would assume (I AM NOT A DOCTOR JUST TO START), that taking one pill wouldn't do much. The Pill Book mentions nothing about "getting high" NOR having a addiction potential BUT, with all drugs of this type (any drugs for that matter) your friend should not be "experimenting" like this.
The MOST COMMON SIDE EFFECTS are:
1) Dizziness from a sitting/lying position to a standing.
2) Headache
3) Tiredness
4) Upset Stomach
5) Weight Gain
6) Dry Mouth
[Preaching]
Just to point out, you asked if it "made you high"? Well, ask your friend since he took it. I am not trying to sound like a @SS or anything but experimentation with prescription drugs is not only careless but in some circumstances, can be deadly! I am glad that you said no to his offer since medications affect everyone differently. He may be able to tolerate a certain drug while you on the other hand may have a adverse reaction that ends in tragedy.
[/end preaching]
More info can be found below:
http://Seroquel.drugs.com/
Regards,
J