Definition: Arretine is a medication that is used to treat high blood pressure. It works by blocking the action of two substances in the body called beta-blockers, which help to lower your heart rate and blood pressure. Arretine can be taken by itself or with other medications, such as ACE inhibitors or angiotensin-converting enzyme (ACE) inhibitors. However, it is important to talk to your doctor before starting any new medication, especially if you are taking other drugs that may interact