OSCAR BURRIEL / SCIENCE PHOTO LIBRARY OSCAR BURRIEL / SCIENCE PHOTO LIBRARY
Heart drugs. Composite image of a human heart and an assortment of drugs on glass shelves. Drugs affecting the heart include the beta-blockers, which are used to treat angina pectoris (chest pain due to a lack of oxygen in the heart muscle), hypertension (high blood pressure) and cardiac arrhythmia (irregular heartbeat).
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