A novel substituted oxa/thiadiazolylazetidinonyl/thiazolidinonylcarbazoles (4a-j), (5a-j) and (6a-j) were synthesized and screened for their antipsychotic and anticonvulsant activities. It is concluded from the results compound 6j showed promising antipsychotic as well as anticonvulsant activity. (C) 2010 Elsevier Masson SAS. All rights reserved.