A slow, tight binding and highly selective inhibitor of iNOS (inducible nitric oxide synthase/NOS II) (Kd < 7 nM). Weak and reversible inhibition of nNOS (neuronal nitric oxide synthase/NOS I) (Ki < 2) and eNOS (endothelial nitric oxide synthase/NOS III) (Ki < 50 µM). Inhibits tumor growth. Increases vasoconstriction to noradrenaline. Improves contractile function. Improves stroke outcome and decreases glutamate release. Anti-inflammatory. Review.