This invention relates to novel diazabicyclic aryl compounds of the formula wherein: R′ represents hydrogen or alkyl; A represents an aromatic monocyclic or bicyclic carbocyclic or heterocyclic; and is hydrogen or a subsituent as defined in the specification. The compounds are cholinergic ligands at the nicotinic acetylcholine receptors and modulators of the monoamine receptors and transporters. The compounds of the invention may be useful for the treatment of diseases or disorders as diverse as those related to the cholinergic system of the central nervous system (CNS), the peripheral nervous system (PNS), diseases or disorders related to smooth muscle contraction, endocrine diseases or disorders, diseases or disorders related to neuro-degeneration, diseases or disorders related to inflammation, pain, and withdrawal symptoms caused by the termination of abuse of chemical substances.