KT5720 is a potent, cell-permeable, specific, reversible and ATP-competitive PKA inhibitor (IC50=3.3 μM) . KT5720 is effective in reversing MDR1-mediated multidrug resistance. KT5720 also reduces the excitability of dorsal root ganglion (DRG) neurons by attenuating Hyperpolarization-activated cyclic nucleotide-gated (HCN) channel activity and reducing intracellular Ca2+ concentrations. KT5720 can be used in the study of haematological malignancies as well as HCN and DRG neuron-related diseases[1][2][3].