Calcium Blood Level Elevation After Atorvastatin Initiation in a Patient With Hyperparathyroidism.

Atorvastatin is a very common medication used for lowering blood cholesterol levels. The drug has known adverse effects, but an elevation in calcium levels is not listed as one of them. We report a 52-year-old man with hyperparathyroidism and hypercholesterolemia, who, under treatment with atorvastatin, developed an additional rise in calcium levels. He was asymptomatic, and during the investigation of his hypercalcemia, a drug adverse effect was suspected. Therefore, atorvastatin therapy was stopped, and calcium levels dropped as a result. Subsequent readministration of atorvastatin and its cessation produced similar results. While hypercalcemia is not listed as a common adverse effect of atorvastatin, we introduce such a phenomenon along with possible underlying mechanisms. Although our patient was asymptomatic, hypercalcemia can be a dangerous condition, especially in a population where the initial calcium levels are already elevated.