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QR-334 is a pharmaceutical compound that was under investigation for the treatment of sialorrhea, which is characterized by excessive secretion of saliva from the salivary glands. The drug was being developed by Quigley Pharma, a subsidiary of Quigley Corporation. Its precise mechanism of action has not been publicly disclosed, and there are no reports indicating approval or late-stage clinical development. The available information suggests it was in early-stage research as a potential therapy for sialorrhea[1][2][3][4].
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