Key takeaways
Phenytoin (Dilantin) and propranolol (Inderal LA) are both prescription medications, but they serve different purposes and belong to different drug classes. Phenytoin is an antiepileptic medication used to treat and prevent various types of seizures, while propranolol is a non-selective beta blocker used to manage high blood pressure, chest pain, migraines, and other conditions. Phenytoin works by decreasing abnormal signals between nerve cells in the brain to prevent seizures, whereas propranolol slows down your heart rate and relaxes blood vessels. Phenytoin requires regular blood tests to monitor levels and can cause serious side effects like liver damage, while propranolol can hide symptoms of low blood sugar and overactive thyroid. Propranolol can also increase the risk of heart failure or worsening of existing heart failure. Both medications are available as low-cost generics, but need to be taken multiple times a day. However, extended-release forms are available for both medications, which requires once daily dosing.
