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.
Anti-angiogenesis drugs: These drugs, halt the process of developing new blood vessels (angiogenesis). For example, the drug bevacizumab (brand name Avastin), and antibody against vascular endothelial growth factor (VEGF), is used to treat cancer, and also to treat macular degeneration in the eye.