Journal article Open Access

The serotonin syndrome and its treatment

Gillman, P. K.

Serotonin syndrome is caused by drug induced excess of intrasynaptic 5- hydroxytryptamine. The clinical manifestations are mediated by the action of 5-hydroxytryptamine on various subtypes of serotonin receptors. There is no effective drug treatment established. The history of the treatment of serotonin syndrome with 5-hydroxytryptamine blocking drugs is reviewed. A literature search was undertaken using both Medline and a manual search of the older literature. Reports of cases treated with the 5-HT2 blockers cyproheptadine and chlorpromazine were identified and analysed. There is some evidence suggesting the efficacy of chlorpromazine and cyproheptadine in the treatment of serotonin syndrome. The evidence for cyproheptadine is less substantial, perhaps because the dose of cyproheptadine necessary to ensure blockade of brain 5-HT2 receptors is 20-30 mg, which is higher than that used in the cases reported to date (4-16 mg).
Files (171.9 kB)
Name Size
171.9 kB Download
Views 192
Downloads 419
Data volume 72.0 MB
Unique views 189
Unique downloads 404


Cite as