Sodium channel blockers are a class of medications that inhibit the flow of sodium ions through sodium channels in cell membranes. These channels play a crucial role in generating electrical signals in nerve and muscle cells. By blocking these channels, the medications can help stabilize cell membranes, reducing excitability and preventing abnormal electrical activity, which is particularly useful in treating conditions like epilepsy and arrhythmias. Common examples of sodium channel blockers include lidocaine, used primarily as a local anesthetic, and carbamazepine, which is often prescribed for seizure disorders and certain types of nerve pain. These drugs can help manage symptoms by preventing excessive neuronal firing and maintaining a more stable electrical environment in the affected tissues.