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.
Angina is a pain that comes from the heart. It is usually caused by narrowing of the coronary arteries. This narrowing causes a reduced blood supply to part, or parts, of the heart muscle. The narrowing is caused by fatty patches or plaques (atheroma) which develop within the inside lining of arteries.