Agmatine sulfate is a putative endogenous neurotransmitter at imidazoline receptors. It displaces clonidine at α2-adrenergic and at imidazoline receptors, and blocks NMDA-activated ion channels in hippocampal neurons._x000d_
It is also an intermediate in the biosynthesis of the polyamines putrescine and spermine. Agmatine is a competitive inhibitor of nitric oxide synthase activity owing to mimicry of the natural NOS substrate arginine.
1-Amino-4-guanidinobutane sulfate salt, 4-Guanidinobutylamine sulfate salt, N-(4-Aminobutyl)guanidine sulfate salt