Is there an interaction between B-complex, vitamin D, calcium magnesium and Decadron and Somatuline injection?

In the treatment of an endocrine carcinoid tumor in the small intestine, metastasized to the liver. Onset of cancer in 2015. Symptoms related to diarrhea and flush. On the carcinoid canada website it was said that often patients who would receive injections (hormone mimics) such as somatuline or sandostatin would come to lack vit b and d.