Also available in 1 mL, 25 mg, 50 mg, 200 mg, 500 mg and bulk. Please contact Fisher for quotes. Pimavanserin tartrate is a potent 5-HT 2A receptor inverse agonist used to treat Parkinson's disease-related psychosis, with the most potent inhibitory activity on the NFAT signaling pathway. Purity 99.98%