Capeserod (INN; development code SL65.0155) is a selective 5-HT<sub>4</sub> receptor partial agonist with K<sub>i</sub> = 0.6 nM and IA = 40âÂÂ50% (relative to serotonin). It potently enhances cognition, learning, and memory, and also possesses antidepressant effects. Capeserod was in phase II clinical trials around 2004âÂÂ2006 for the treatment of memory deficits and dementia but no new information has surfaced since and it appears to have been abandoned.