Tertiapin-Q is primarily used in research to study the function of specific potassium channels, particularly the G protein-activated inwardly rectifying potassium (GIRK) channels. It acts as a potent and selective blocker of these channels, making it a valuable tool in neuroscience and pharmacology. Researchers utilize it to investigate the role of GIRK channels in various physiological processes, such as neuronal signaling, heart rate regulation, and the effects of neurotransmitters. Its application extends to understanding the mechanisms underlying conditions like epilepsy, addiction, and cardiac arrhythmias, providing insights for potential therapeutic targets. Additionally, Tertiapin-Q is employed in electrophysiological experiments to dissect the contributions of GIRK channels in cellular and tissue responses.