The active ingredient in Atenolol is atenolol, a type of beta-blocker. Beta-blockers work by blocking the body’s response to adrenaline. Adrenaline normally results in the constriction (narrowing) of the blood vessels, so by blocking this mechanism, the blood vessels are better able to relax and widen, reducing your blood pressure and improving blood flow around the body.
Atenolol blocks the response to beta-adrenergic stimulation. This type of stimulation results in the constriction of blood vessels. It selectively blocks beta1-receptors with little effect on beta2-receptors. Black Box Warning: Do not stop abruptly.
In addition to Atenolol, the inactive ingredients are:
Magnesium stearate, maize starch, sodium lauryl sulphate, colloidal anhydrous silica, sodium starch glycollate, magnesium carbonate, hypromellose, macrogol 6000, titanium dioxide, purified talc