Atenolol USP is a beta-blocker medication used to treat high blood pressure, chest pain (angina), and other conditions related to cardiovascular health. It is classified as an active pharmaceutical ingredient (API), which means it is the main component responsible for the therapeutic effects of the medication.

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Atenolol USP works by blocking the action of adrenaline on the heart and blood vessels, slowing and reducing the force of the heart's contractions. This helps to lower blood pressure, decrease the heart's oxygen demand, and improve cardiovascular function.

In addition to its use as a standalone medication, atenolol USP can also be combined with other active pharmaceutical ingredients to create a fixed-dose combination medication for the treatment of hypertension.

The USP in Atenolol USP stands for "United States Pharmacopeia," which is an official public standards-setting authority for prescription and over-the-counter medicines and other healthcare products manufactured or sold in the United States. This ensures that the medication meets strict quality and purity standards.

Overall, Atenolol USP is an important and effective API used in the treatment of cardiovascular conditions, and it is available in various brand and generic formulations.