Monday Blues – Rare Cause of Hypoglycemia in a Child with Leukemia

Hypoglycemia in a child with acute lymphoblastic leukemia (ALL) often makes the clinician think of sepsis or metabolic disturbances due to relative adrenal insufficiency with steroid withdrawal. We report a rare scenario of drug-induced hypoglycemia in a child on treatment for ALL. Recurrent symptomatic episodes of hypoglycemia in a 4-year-girl on treatment for high-risk ALL were analyzed and it was surprising to note that the episodes were noted on early hours on Monday and Sunday nights. Detailed evaluation for the etiology and the workup was not contributory. With the background of drug history for ALL maintenance and occurrence of episodes on Mondays, possibility of drug-induced hypoglycemia secondary to cotrimoxazole was considered. Dose alteration for trimethoprim-sulfamethoxazole was considered stopping the drug is not feasible. Malnutrition was attributed as the coexisting risk factor in our child.