Tenormin 100mg tablets contain atenolol, a beta-blocker medication used to treat high blood pressure, angina, and certain heart rhythm disorders. Each pack contains 28 tablets manufactured by AstraZeneca, with each tablet containing 100mg of the active ingredient atenolol. Tenormin works by blocking the action of certain natural chemicals in your body (such as epinephrine) that affect the heart and blood vessels. This helps to reduce blood pressure, heart rate, and strain on the heart. The tablets should be taken orally as prescribed by your healthcare provider, typically once daily. The medication comes in a distinctive white box with orange and blue labeling, clearly displaying the Tenormin brand name and AstraZeneca logo. This is a prescription-only medication that requires medical supervision.