

| Definition of 5-HT | A basic definition of serotonin. |
| Serotonin Receptors and their Function | A detailed description of the various 5-HT receptors and their function. |
| Serotonin: The Neurotransmitter for the '90s | A very complete explanation of serotonin and its functions. |
| Contraction of Temporal Arteries | Spontaneous and 5HT-induced cyclic contractions in superficial temporal arteries from chronic and episodic cluster headache patients. |
| 5HT Receptors | The biology of serotonin receptors: focus on migraine pathophysiology and treatment. |
| 5HT and Aggression | Aggression heightened by alcohol or social instigation in mice: reduction by the 5-HT(1B) receptor agonist CP-94,253. |
| Hyperbaric Oxygen | Hyperbaric oxygen in chronic cluster headaches: influence on serotonergic pathways. |
| Unresponsiveness to Sumatriptan | Is the unresponsiveness to sumatriptan in cluster headache related to an alteration in the 5-HT receptors? |
| 5HT Metabolism | Serotonin metabolism in cluster headache |
| 5HT Basics | A primer on the actions of serotonin. Spoken of in terms of depression. |
| 5HT and Sleep | The relationship between sleep (REM) and 5HT. |
| 5HT and Stress | Evidence of a relationship between 5HT levels and stress. |
| Investigations with Serotonin and Hallucinogenic Agents | An article by Dr. Glennon of the Glennon Research Group. 5HT and LSD. |
| Ecstasy Use Depletes Brain’s Serotonin Levels | MDMA and serotonin levels in the brain. |
| 5HT and Cocaine Addiction | Perhaps a reason why clusterheads can be heavy smokers and drinkers. |