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/flɛˈkeɪˌnaɪd/ · noun
(pharmacology) An antiarrhythmic drug administered in the form of its acetate C₁₇H₂₀F₆N₂O₃·C₂H₄O₂ especially to treat serious ventricular arrhythmias..
Use flecainide when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Flecainide means (pharmacology) An antiarrhythmic drug administered in the form of its acetate C₁₇H₂₀F₆N₂O₃·C₂H₄O₂ especially to treat serious ventricular arrhythmias..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use flecainide where its definition matches the intended context.
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