<prompt> Which does not act by blocking NMDA receptors?MethoxetamineMethadoneKetamineDiltiazem  <response>: Ans. is d i.e., Diltiazem Drugs acting by blocking NMDA receptors are: Methoxetamine Phencyclidine Methadone Dizocilpine Felbamate Dextropropoxyphene Acamprost Tramadol Ketamine Pethidine Atomoxetine Nitrous oxide 