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Doxycycline (DOX) is a tetracycline antibiotic that is prescribed for treating a variety of infections involving the skin, respiratory tract, and urogenital system. Adversely, esophageal mucosal injury due to DOX is well described; however, gastric mucosal injury is less commonly reported and may result in severe gastrointestinal hemorrhage and occasionally, perforation. In most reported cases of DOX-induced gastric lesions, patients are symptomatic upon presentation leading to endoscopic evaluation and diagnosis with biopsy. However, severe gastric insults may go unrecognized in rare cases of asymptomatic patients, increasing the risk of mortality.

Rhabdomyolysis (RBD) occurs secondary to tissue injury, resulting in (muscle) cell lysis and release of intracellular electrolytes and proteins into circulation. An elevation in the muscle enzyme, creatine kinase (CK), is a diagnostic marker and indicates muscle breakdown. Symptoms include dark urine caused by release of myoglobin, myalgias, and acute kidney injury (AKI). RBD is categorized as (1) traumatic, (2) nontraumatic exertional (ie, metabolic myopathies), or (3) non-exertional and non-traumatic. Clostridioides difficile (CD) has been previously reported to cause RBD, but the risk factors, pathogenesis, and recommended treatment regimen remain unclear.

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