“…Many medications have topical toxic effects on the esophageal mucosa, including the production of local hyperosmolarity (as occurs with potassium chloride), pH and osmolarity-altering effects (as seen with ferrous sulfate), and intracellular uptake and cytotoxicity (as occurs with doxycycline and NSAIDs) [6,11,12]. However, the mechanisms of mucosal injury caused by some medications, including caffeine tablets, are unclear [13].…”