... lower (approximately 1 / 5) intravenous toxicity (in rabbits), a lower (approximately 1 / 8) pyretogenic effect, an equal psychological effect in man, and double the antiserotonin ...
http://en.wikipedia.org/wiki/ALD-52
Antiserotonin medications. Methysergide (Sansert) prevents migraine headaches by constricting blood vessels and reducing inflammation of the blood vessels.
http://www.medicinenet.com/migraine_headache/page6.htm
... studies also suggest that pizotyline could be used in the treatment of serotonin syndrome or MDMA overdose [6] in a similar manner to the closely related antihistamine/antiserotonin ...
http://en.wikipedia.org/wiki/Pizotifen
Article Title: On the central antiserotonin action of trazodone. Article Source: Pol J Pharmacol Pharm 1979 Jan-Feb;31(1):25-33 Author(s): Baran L; Maj J; Rogoz Z; Skuza G
http://www.erowid.org/chemicals/lsd/lsd_health3.shtml