This enzyme belongs to the family of oxidoreductases, specifically those acting on NADH or NADPH with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is NADPH:NAD+ oxidoreductase (B-specific). Other names in common use include pyridine nucleotide transhydrogenase, transhydrogenase, NAD(P)+ transhydrogenase, nicotinamide adenine dinucleotide (phosphate) transhydrogenase, NAD+ transhydrogenase, NADH transhydrogenase, nicotinamide nucleotide transhydrogenase, NADPH-NAD+ transhydrogenase, pyridine nucleotide transferase, NADPH-NAD+ oxidoreductase, NADH-NADP+-transhydrogenase, NADPH:NAD+ transhydrogenase, H+-Thase, non-energy-linked transhydrogenase, and NAD(P)+ transhydrogenase (B-specific). This enzyme participates in nicotinate and nicotinamide metabolism. It employs one cofactor, FAD.
You KS; Oppenheimer, Norman J. (1985). "Stereospecificity for nicotinamide nucleotides in enzymatic and chemical hydride transfer reactions". CRC. Crit. Rev. Biochem.17 (4): 313–451. doi:10.3109/10409238509113625. PMID3157549.