Tincture of opium, also known as laudanum, is an alcoholic solution containing opium and other ingredients. It has been used for centuries as a pain reliever and sedative. Laudanum is derived from the Latin word 'laudare, ' which means 'to praise.' It was first used in the 16th century and was widely prescribed by doctors until the early 20th century. Today, it is still used in some countries as a pain reliever and sedative.