- Vitamin activity D3 can decrease with its simultaneous use with phenytoin or barbiturates.
- With simultaneous treatment with cardiac glycosides, ECG and clinical monitoring are necessary, calcium preparations can potentiate the therapeutic and toxic effects of cardiac glycosides.
- Preparations of calcium and vitamin D3 can increase the absorption of tetracyclines from the gastrointestinal tract. Therefore, the time interval between taking a tetracycline drug and Calcium D3 CLASSIC must be at least 3 hours.
- To prevent the absorption of bisphosphonate or sodium fluoride drugs, it is recommended to take Calcium D3 CLASSIC not earlier than 2 hours after their admission.
- Glucocorticosteroids reduce the absorption of calcium, so treatment with glucocorticosteroids may require an increase in the dose of Calcium D3 CLASSIC.
- Simultaneous treatment with colestyramine or laxatives based on mineral or vegetable oil can reduce the absorption of vitamin A D3.
- With the simultaneous use of thiazide diuretics, the risk of hypercalcemia increases, because they increase the tubular reabsorption of calcium.
Furosemide and other "loop diuretics", on the contrary, increase the excretion of calcium by the kidneys.
- In patients who simultaneously take cardiac glycosides and / or diuretics, it is necessary to monitor the concentration of calcium and creatinine in the serum.