Fosteum Disease Interactions

The use of genistein is contraindicated in patients with a history of cancer of the breast or reproductive organs and should be used with caution by women who have a history of breast or reproductive cancer in first degree female relatives.

Vitamin D analogs function to increase serum calcium concentrations and can exacerbate arrhythmias, particularly in patients receiving cardiac glycosides. Therapy with vitamin D analogs should be administered cautiously in patients with or predisposed to cardiac arrhythmias. Clinical monitoring of serum electrolyte concentrations and cardiac function is recommended.

Vitamin D analogs administered in the presence of hyperphosphatemia can result in precipitation of calcium-phosphate deposits within the vascular or renal systems or other soft tissue calcifications. A solubility product (Serum Calcium X Phosphate) should not exceed 70. Serum electrolyte concentrations should be corrected prior to vitamin D analog therapy and monitored during therapy.

Vitamin D analogs such as calciferol and ergocalciferol should not be given to patients with hypercalcemia, malabsorption syndrome, or evidence of vitamin D toxicity.

Ergocalciferol, cholecalciferol, and calcifediol undergo renal biotransformation during metabolic activation. Renal impairment can alter metabolic and therapeutic activity of certain vitamin D analogs. Alternative vitamin D analogs such as dihydrotachysterol (hepatic activation) and calcitriol (active form) may be considered in patients with compromised renal function.

The trace metals, chromium and zinc, are excreted primarily in the urine. Selenium is partially excreted in the urine. Supplemental doses of these agents may need to be adjusted, reduced, or omitted in patients with renal dysfunction.

Genistein in the combination product containing genistein, zinc glycinate citrate, and cholecalciferol significantly reduces fasting glucose and insulin levels, as well as insulin resistance. Care should be exercised when using products containing genistein in diabetic patents.

Patients with gastrointestinal malabsorption taking the combination product containing genistein, zinc glycinate citrate, and cholecalciferol may require higher doses of vitamin D3. It is recommended to measure serum levels of 25-hydroxycholecalciferol regularly in this population.

The trace metals manganese, chromium, copper, selenium, and zinc are absorbed in the GI tract from dietary sources and following administration of oral supplements. GI absorption may be decreased in patients with malabsorption syndromes. Therefore, larger dosages may be required when these supplements are given orally. Parenteral administration may be appropriate.

Vitamin D analogs are fat soluble and oral formulations require bile for adequate intestinal absorption. Hepatic and/or biliary dysfunction decrease the absorption of vitamin D analogs. Metabolites of vitamin D analogs are primarily excreted in bile and feces. Ergocalciferol, cholecalciferol, and dihydrotachysterol undergo hepatic hydroxylation during metabolic activation. Hepatic impairment can alter the metabolic and therapeutic activity of certain vitamin D analogs. Alternative vitamin D analogs such as calcifediol (requires renal activation) and calcitriol (active form) may be considered in patients with compromised hepatic function.