Altanserin
![](/Images/godic/202412/20/Altanserin.svg3608.png")
![A PET scanner. Human experiments with fluorine-18 altanserin are performed in these types of brain scanners.](/Images/godic/202412/20/ECAT-Exact-HR--PET-Scanner3608.jpg")
![Altanserin synthesis: U.S. Patent 4,522,945](/Images/godic/202412/20/Altanserin_synthesis.svg3608.png")
Altanserin is a compound that binds to the 5-HT2A receptor (5-Hydroxytryptamine (serotonin) 2A receptor). Labeled with the isotope fluorine-18 it is used as a radioligand in positron emission tomography (PET) studies of the brain, i.e., studies of the 5-HT2A neuroreceptors. Besides human neuroimaging studies altanserin has also been used in the study of rats.