The ethanol and aqueous crude extracts and five alkaloids isolated fro
m the roots of Crytolepis sanguinolenta (Lindl.) Schlechter were scree
ned for antibacterial activity against 7 reference strains by the twof
old serial broth microdilution assay. The ethanol extract and the alka
loids cryptolepine and cryptoheptine inhibited the growth of all strai
ns tested except that of Pseudomonas aeruginosa.