Propranolol belongs to a class of medications known as nonselective beta-adrenergic receptor blocking agents, sometimes also referred to as beta blockers. Because of its lack of specificity, it differs from more selective beta blockers such as atenolol, Bystolic, and metoprolol. Propranolol causes an antihypertensive effect (i.e. lower blood pressure) and also reduces cardiac output. Propranolol also has antimigraine and antitremor effects although the mechanism of how it causes these effects is unknown.I am text block. Click edit button to change this text. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut elit tellus, luctus nec ullamcorper mattis, pulvinar dapibus leo.