Which SNRI has a "ghost tablet" in the stool?

The correct answer is based on the known side effect associated with Venlafaxine, which is the presence of a "ghost tablet" in the stool. This phenomenon occurs because Venlafaxine is formulated with an outer coating that may not entirely dissolve during the digestive process. As a result, individuals taking Venlafaxine may notice the tablet's shell in their stool, while the medication has already been absorbed into the system. This can lead to some confusion or concern among patients, but it is a benign occurrence that doesn't indicate any problems with the medication's efficacy.

In contrast, the other options may not have similar noted occurrences. For instance, Fetzima, Savella, and Pristiq do not have widely recognized reports or clinical observations of a "ghost tablet" phenomenon. Therefore, recognizing Venlafaxine as the SNRI associated with this specific side effect helps in understanding patient experiences when taking this medication.