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A 9-year-old girl developed gingival hyperplasia while receiving amlodipine for the treatment of hypertension. The girl, who had a history of hypercholesterolaemia, anaemia, eosinophilic colitis and membranous nephropathy, began receiving oral amlodipine 7.5 mg/day after developing an allergic reaction to enalapril. The dosage of amlodipine was gradually increased to 12.5 mg/day, but the final planned increase to 15 mg/day was not carried out. Her other medications included labetalol, epoetin-α, azathioprine, calcitriol, atorvastatin and budesonide. Approximately 2 years after starting amlodipine, she presented with failure to thrive and inability to gain weight. Physical examination revealed gingival hyperplasia. According to the girl’s mother, her gum swelling had started after the dosage of amlodipine had been increased to 12.5 mg/day. Laboratory investigations included the following: bicarbonate 18 mEq/L …