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ATENOLOL

Atenolol (Tenormin brand name) is used to lower hypertension (high blood pressure). It also is used to prevent angina (chest pain), irregular heartbeats and heart attacks. This medicine works by relaxing your blood vessels so your heart doesn't have to pump as hard. 

Atenolol is a beta-adrenergic blocking agent. It blocks the action of the sympathetic nervous system, a portion of the involuntary nervous system. The sympathetic nervous system stimulates the pace of the heart beat. By blocking the action of these nerves, this medicament reduces the heart rate and is useful in treating abnormally rapid heart rhythms. Atenolol also reduces the force of heart muscle contraction and lowers blood pressure. By reducing the heart rate and the force of muscle contraction, it reduces heart muscle oxygen demand. Since angina occurs when oxygen demand of the heart exceeds supply, this medicine is helpful in treating angina.

SIDE EFFECTS: Atenolol is generally well tolerated, and side effects are mild and transient. Rare side effects include abdominal cramps, diarrhea, constipation, fatigue, insomnia, nausea, depression, dreaming, memory loss, fever, impotence, lightheadedness, slow heart rate, low blood pressure, numbness, tingling, cold extremities, sore throat, and shortness of breath or wheezing.