Potassium channel blockers are a class of medications that inhibit the flow of potassium ions through specific channels in cell membranes. By blocking these channels, they can alter the electrical activity of cells, particularly in the heart and nervous system. This action can help manage various conditions, such as arrhythmias and certain types of neuropathic pain. These blockers can be used to prolong the action potential in cardiac cells, which helps stabilize heart rhythms. Additionally, they may have therapeutic effects in treating conditions like epilepsy and migraine. However, their use must be carefully monitored due to potential side effects.