: any of several bivalent doubled substituted ammonium ions (as decamethonium or hexamethonium) in which the two quaternary nitrogen atoms are separated by a polymethylene chain
methonium salts used in the treatment of hypertension

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“Methonium.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/methonium. Accessed 7 Jul. 2026.

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