Abstract: The combination of 3-phenylsulfonyl-8-piperazinyl-1yl-quinoline or a pharmaceutically acceptable salt thereof with a second therapeutic agent, wherein the second therapeutic agent is selected from: (a) a therapeutic agent known to modify cholinergic transmission such as M1 muscarinic receptor agonists or allosteric modulators, M2 muscarinic antagonists, acetylcholinesterase inhibitors, nicotinic receptor agonists or allosteric modulators, 5-HT4 receptor partial agonists or 5HT1A receptor antagonists and NMDA receptor antagonists or modulators, glutamate antagonists, GABA-ergic antagonists, H3 antagonists, putative metabolic/mitochondrial modulators, or disease modifying agents such as ? or ?-secretase inhibitors, Tau-targeted therapeutics, ?-amyloid aggregation inhibitors and ?-amyloid immunotherapies; (b) an antidepressant such as a tricyclic, a MAOI (Monoamine oxidase inhibitor) a SSRI (Selective Serotonin Reuptake Inhibitor), a SNRI (Serotonin and Noradrenaline Reuptake Inhibitor) or a NaSSA (noradrener