Proterguride (INNTooltip International Nonproprietary Name; developmental code names VUFB-13416, ZK-39437), also known as 6-propylterguride or 6-propyl-9,10-dihydrolisuride, is a dopamine agonist of the ergoline family described as a prolactin inhibitor and antiparkinsonian agent which was never marketed. It is closely structurally related to certain other ergolines like terguride and lisuride. Besides dopamine receptors, the drug also interacts with serotonin, adrenergic, and histamine receptors. Proterguride was first described in the literature by at least 1981.