The present invention discloses 4-oxo-3, 5-dihydro-4h- pyridazino[ 4,5-B] indole-1-acetamide-derivative compounds corresponding to the general formula (I) in which X represents a hydrogen or halogen atom or a methyl, methoxy or phenylmethoxy group, Y represents a hydrogen atom, 1 or 2 halogen atoms or a hydroxyl, methoxy, nitro or methyl group, R1 represents a hydrogen atom or a (C1-C4)alkyl group, R2 and R3 each represent, independently of one another, a hydrogen atom, a (C1-C4)alkyl group or a phenylmethyl group, or else R2 and R3 form, with the nitrogen atom which carries them, an azetidinyl, pyrrolidinyl, 3 - ethoxypyrrolidinyl, piperidinyl, morpholinyl, 4- methylpiperazinyl or 1,3-thiazolidinyl group.
