Which beta blocker is classified as a non-selective beta blocker?

Propranolol is classified as a non-selective beta blocker because it inhibits both beta-1 and beta-2 adrenergic receptors throughout the body. This dual action can lead to lowered heart rate and blood pressure due to its effects on the heart (beta-1 blockade) and can also cause bronchoconstriction and peripheral vasodilation due to its blockade of beta-2 receptors.

In contrast, atenolol and metoprolol are selective beta-1 blockers, primarily affecting the heart and minimally impacting other tissues. Timolol, while it also has some selective properties, is often classified as a non-selective beta blocker for its broader range of receptor activity similar to propranolol, but primarily recognized through its use in treating glaucoma and hypertension. Selecting a non-selective beta blocker like propranolol can be beneficial in certain conditions, but it requires careful consideration in patients with respiratory conditions due to the potential for bronchospasm.