Chemistry and pharmacology of serotonin.
Monoamine Neurotransmitters: open-access ebook chapter with animations and self-quiz.
Recent news on serotonin.
Detailed information on serotonin syndrome.
Chemistry and pharmacology of MDMA.
National Institute on Drug Abuse site for MDMA (Ecstasy/Molly).
Video describing selective serotonin reuptake inhibitors and receptors.
Map of the genetics of the serotonin transporter.