The story
Probably from but(yl) + do(p)amine.
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: A strongly inotropic catecholamine administered intravenously in the form of its hydrochloride C₁₈H₂₃NO₃·HCl especially to increase cardiac output and lower wedge pressure in heart failure and after cardiopulmonary bypass surgery Full definition →
Probably from but(yl) + do(p)amine.
Etymology from Wiktionary, CC BY-SA 4.0.