guaifenesin(redirected from Alfen Jr)
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An expectorant drug, C10H14O4, that is used to thin mucus and sputum.
[Alteration of guaiphenesin : guai(acol) + (me)phenesin, a muscle relaxant drug (me(thyl) + phen(yl) + (an)es(thetic) + -in).]
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