Allegra-D tablets in their stool
Some patients are concerned about seeing Allegra-D tablets in their stool. What they're noticing is a "ghost tablet."
It's the shell of the tan half of Allegra-D that contains extended-release pseudoephedrine. The tan half slowly releases the drug from an insoluble wax matrix that can show up in the stool.
The white half of Allegra-D is immediate-release fexofenadine. It breaks off in the GI tract and dissolves completely.