SCH-58261

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SCH-58261 is a research drug that blocks the adenosine A2A receptor very selectively—more than 50 times more selective for A2A than for other adenosine receptors. In studies, it has been used to explore how caffeine works. Caffeine is a mix of A1 and A2A antagonists, and research suggests the A2A receptor mainly drives caffeine’s stimulant effects; to mimic caffeine’s full actions in animals, both A1 and A2A blockade are usually needed. SCH-58261 has also shown antidepressant, nootropic (cognitive-enhancing), and neuroprotective effects in various animal models and has been investigated as a possible treatment for Parkinson’s disease. It is primarily a research compound and not an approved medicine.