Psychotridine is an alkaloid that has been found inP. forsterianaand has diverse biological activities.^1,2,3It inhibits ADP-, collagen-, or thrombin-induced aggregation of washed isolated human platelets with IC₅₀values of 1.4, 1.4, and 3.9 µM, respectively.¹Psychotridine (2.5 or 5 µM) is cytotoxic to HTC rat hepatocellular carcinoma cells.²It reduces paw licking induced by capsaicin in mice when administered at doses of 0.5, 2.5, or 5 mg/kg.³

1.Beretz, A., Roth-Georger, A., Corre, G., et al.Polyindolinic alkaloids from Psychotria forsteriana. Potent inhibitors of the aggregation of human plateletsPlanta Med.51(4)300-303(1985) 2.Roth, A., Kuballa, B., Bounthanh, C., et al.Cytotoxic activity of polyindoline alkaloids of Psychotria forsteriana (Rubiaceae) (1)Planta Med.6450-453(1986) 3.Amador, T.A., Verotta, L., Nunes, D.S., et al.Involvement of NMDA receptors in the analgesic properties of psychotridinePhytomedicine8(3)202-206(2001)