Elemental potassium is a soft silvery-white alkali metal that oxidizes rapidly in air and reacts vigorously with water, generating sufficient heat to ignite hydrogen emitted in the reaction and burning with a lilac flame.
An antianginal is any drug used in the treatment of angina pectoris, a symptom of ischaemic heart disease.
Causes. Angina is usually a sign of coronary artery disease (CAD). It occurs when the blood vessels leading to the heart are blocked. The blockage decreases the blood and oxygen flow to the heart muscle. When the heart muscle is deprived of oxygen, you will feel chest pain and other symptoms.