Fasting and bed rest, even for a relatively short period, are risk factors for ceftriaxone-associated pseudolitiasis.

Background: Cholelithiasis is one of the side-effects of ceftriaxone (CTRX). Reportedly, the cholelithiasis resolves relatively soon after cessation of CTRX, hence, it is called pseudolithiasis. Previous reports have suggested that biliary pseudolithiasis can cause not only gallstone attacks, but also severe adverse events, such as cholecystitis and pancreatitis. The purpose of this study was to prospectively elucidate the risk factors and clinical features of CTRX-associated pseudolithiasis in pediatric patients.

Methods: We prospectively examined the incidence and clinical outcome of CTRX-associated biliary pseudolithiasis. Subjects included infants and children who were admitted to hospital with acute disease. Ultrasonography was used to confirm the absence of stones and sludge in the gallbladder before CTRX therapy, and in assessment of pseudolithiasis on days 3, 5, 7 and 10 after initiation of CTRX in all subjects. The pseudolithiasis group was then compared with the non-pseudolithiasis group in terms of age, sex, CTRX dose, CTRX duration, duration of fever, fasting period, period of bed rest, and blood test results.

Results: Sixty patients were enrolled in the study. Eleven of them had biliary pseudolithiasis on ultrasonography (18.3%). Formation of biliary pseudolithiasis was prevalent in the fasting and bed rest groups, appearing relatively early in these groups.

Conclusions: Special attention should be paid to the degree of oral intake and patient activity when CTRX is prescribed. We recommend regular ultrasonographic follow up of patients receiving CTRX, to evaluate the formation of biliary pseudolithiasis.