pentamethonium

noun
pen·ta·me·tho·ni·um | \ˌpent-ə-me-ˈthō-nē-əm \

Medical Definition of pentamethonium 

: an organic ion [C11H28N2]2+ used in the form of its salts (as the bromide and iodide) for its ganglionic blocking activity in the treatment of hypertension

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