Substantial progress has been registered during the past five years in the realm of the dimeric aporphinoid alkaloids. These classically include the aporphine-benzylisoquinoline dimers, the proaporphine-benzylisoquinoline dimers, and the hernandaline-type alkaloids which are oxidation products of the aporphine-benzylisoquinolines. To this listing must now be added novel structural types of dimeric aporphinoids, such as uskudaramine, which is an aporphine-benzylisoquinoline dimer bonded through carbon-to-carbon linkage, and the bisaporphines, which are dimeric aporphinoids also connected through carbon-to-carbon bonding. © 1984, American Chemical Society. All rights reserved.