Zatebradine is a potent hyperpolarization-activated cyclic nucleotide-gated (HCN) channels inhibitor(IC50 of 1.96 µM).

Zatebradine hydrochloride (UL-FS-49CL) is a highly effective and effective HCN Channel inhibitor (IC50:1.96 µM). HCN Channel is an effective hyperpolarization activated loop nucleotide gated channel. Zatebradine hydrochloride blocks slow inward currents through human HCN1, HCN2, HCN3, and HCN4 channels with IC50 values of 1.83 µM, 2.21 µM, 1.90 µM, and 1.88 µM, respectively.