A person may develop a blue tongue by a number of mechanisms.
Conditions associated with a blue tongue:
(1) cyanosis associated with cardiopulmonary disease
(2) oral ingestion of Rivotril (clonazapam)
(3) oral ingestion of a blue dye such as Prussian blue
(4) selective D2 dopamine antagonism (metoclopramide, haloperidol, risperidone)
(5) dietary intake (blueberries, blue food coloring, etc)
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Specialty: Otolaryngology, Pharmacology, clinical
