Voltage-gated K+ channels are involved in maintaining membrane potential and regulating cell volume. They are also important for determining the cellular response to the external stimulus of neurotransmitters and neuro-peptides1. Their diverse functions include regulating neurotransmitter release, heart rate, insulin secretion, neuronal excitability, epithelial electrolyte transport, smooth muscle contraction, and cell volume.KV5.1 is expressed in heart, skeletal muscle, brain, kidney, and pancreas. A recent study revealed the expression of KV5.1 in isolated urinary bladder smooth muscle (UBSM) myocytes