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Magnesium-containing antacids and Calomin Inj should not be used concomitantly because such use may lead to the development of hypermagnesemia.
When vitamin D derivatives and cardioglycosides have been administered concomitantly, cardiac arrhythmia may occur.
Efficacy of vitamin D may be reduced in patients with barbiturates or anticonvulsants.
Corticosteroids have been shown antagonization of vitamin D derivatives.
