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Atenolol
Atenolol is a selective β1 receptor antagonist, a drug belonging to the group of beta blockers (sometimes written β-blockers), a class of drugs used primarily in cardiovascular diseases. Introduced in 1976, atenolol was developed as a replacement for propranolol in the treatment of hypertension. It works by slowing down the heart and reducing its workload. Unlike propranolol, atenolol does not pass through the blood–brain barrier to a large extent thus decreasing the incidence of various central nervous system side effects.
Atenolol is one of the most widely used β-blockers in the United Kingdom and was once the first-line treatment for hypertension. The role for β-blockers in hypertension was downgraded in June 2006 in the United Kingdom to fourth-line, as they perform less appropriately or effectively than newer drugs, particularly in the elderly.
==Medical uses==
Atenolol is used for a number of conditions including: hypertension, angina, long QT syndrome, acute myocardial infarction, supraventricular tachycardia, ventricular tachycardia, and the symptoms of alcohol withdrawal.〔(【引用サイトリンク】url=http://www.drugs.com/monograph/atenolol.html )〕
Due to its hydrophilic (water-attracting) properties, the drug is less suitable in migraine prophylaxis compared to propranolol, because, for this indication, atenolol would have to reach the brain in high concentrations, which is not the case, because atenolol does not pass through the blood–brain barrier.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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