What is the generic name for the drug class of antiarrhythmic?

Amiodarone is recognized as the generic name for a drug that belongs to the antiarrhythmic class. Antiarrhythmics are medications used to treat disorders related to the heart's rhythm, helping to restore or maintain a normal heartbeat. Amiodarone works by influencing the electrical signals in the heart, which helps to manage and prevent various types of arrhythmias, including ventricular tachycardia and atrial fibrillation.

The other options listed do not fall under the antiarrhythmic category. Diphenoxylate is an antidiarrheal medication, used primarily to treat diarrhea. Raloxifene is a selective estrogen receptor modulator (SERM), often prescribed for osteoporosis in postmenopausal women. Nortriptyline is a tricyclic antidepressant, used primarily to treat depression and certain types of chronic pain. Therefore, while these drugs serve important roles in their respective therapeutic areas, they do not relate to the class of antiarrhythmic medications.