From the stem bark of Strychnos decussata (Pappe) Gilg (Loganiaceae), five tertiary indole alkaloids have been isolated and identified. Previously known alkaloids, but new to this plant, were: akagerine (1) and 17-O-methylakagerine (2), while alkaloids newly found in nature were 10-hydroxy-21-O-methylkribine (3a), 10-hydroxyepi-21-O-methylkribine (3b) and 10-hydroxy-17-O-methylakagerine (4). Structures have been ascribed to the new compounds on the basis of their spectral, particularly nmr, data. The pharmacological activity of the alkaloids is also discussed.