Where can I find pharmacology information?

I am making a poster about drugs and their effects...

i want to discover why a certain molecule with its specific functional groups have the effects it does on the brain, specifically by affecting different neurotransmitters and receptors and how those changes alter emotions/mood/mindset/perception etc.

basically: the effects of different organic functional groups on the brain

handbook, ebooks, or textbooks are great.
Answers:
www.pharmacology2000.com or the book Pharmacology by George M. Brenner, Craig Stevens
Drugs.com Source(s): http://www.drugs.com

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