At the start of his career as a physician, while making his rounds at the Edinburgh Royal Infirmary on a cold December night, he noticed a patient whose bouts of angina pectoris were concerningly severe, frequent, and long-lasting. Three years later, Scottish physician Sir Thomas Lauder Brunton brought together all prior research on amyl nitrite and outlined the compound’s medical applications. In 1864, he was the first to theorize that the chemical caused vasodilation. British physiologist Benjamin Ward Richardson believed no other known substance at the time produced such a profound effect on the heart, and even passed around samples of amyl nitrite at a medical conference so his audience could try it for themselves.
