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IDRA 21 (7-chloro-3-methyl-3,4-dihydro-2H-1,2,4-benzothiadiazine S,S-dioxide) has been reported to modulate AMPA receptor kinetics and to improve memory in certain animal models. In the present study, its effects on synaptic transmission and long-term potentiation (LTP) were tested in hippocampal slices. IDRA 21 (500 μM) significantly increased the amplitude and halfwidth of field EPSPs. The drug did not affect mono-synaptic IPSPs but enhanced disynaptically-induced feedforward IPSPs, presumably by acting on AMPA receptors on interneurons. At concentrations that facilitated synaptic transmission, IDRA 21 promoted the induction of LTP; i.e. full potentiation was obtained with stimulation paradigms that were only partially effective in the absence of drug. The results support the hypothesis that drugs which enhance AMPA receptor-mediated currents facilitate LTP.