“Objective We investigated whether the … oxide (NO) precursor, l-arginine , can prevent the antidepressant-… action of the fast-acting antidepressant , ketamine, in a genetic rat model of depression, and/or induce changes in the glutamate (Glu)/N-methyl-d-aspartate receptor (NMDAR)/NO/cyclic guanosine monophosphate (cGMP) signalling pathway.”