<prompt> Mechanism of action of tetanospasminInhibition of GABA releaseInhibition cAMPInactivation of Ach receptorsInhibition of cGMP  <response>: Ans. is a i.e., Inhibition of GABA release . Tetanospasmin blocks the release of inhibitory neurotransmitters GABA and glycine in brain-stem and spinal cord. 