Which drug is indicated for the treatment of nausea and vomiting?

The drug Phenergan is indicated for the treatment of nausea and vomiting because it contains promethazine, which is an antihistamine with antiemetic properties. It works by blocking certain signals in the brain that trigger nausea and vomiting, making it effective for patients experiencing these symptoms from a variety of causes, including motion sickness, chemotherapy, or post-operative recovery.

Other options on the list serve different functions; for example, digoxin is primarily used for heart conditions, such as atrial fibrillation and heart failure. Lidocaine is an anesthetic often used to relieve pain or manage certain heart arrhythmias. Triamterene is a diuretic used to treat fluid retention and hypertension. Since each of these medications has a specific indication unrelated to treating nausea and vomiting, they do not serve the purpose that Phenergan does.