Ascorbic acid/chondroitin/glucosamine/manganese sulfate Disease Interactions

Acute hemolysis following administration of high doses of ascorbic acid in patients with glucose-6-phosphate deficiency (G6PD) has been reported. Ascorbic acid should be administered cautiously and dosages modified in patients with G6PD.

Large doses of ascorbic acid have lead to hyperoxaluria in 5% of patients. Ascorbic acid can acidify urine resulting in precipitation of urate, cystine, or oxalate stones. Ascorbic acid should be administered cautiously and dosages modified in patients predisposed to renal stones. Clinical monitoring of urinalysis for pH and crystal formation is recommended.

Ascorbic acid preparations contain sodium. The sodium content should be considered when used in patients with sodium restricted diets and conditions require sodium restriction, such as congestive heart failure, hypertension, and fluid retention.

The trace elements, copper and manganese, are excreted in the bile. Copper and manganese doses may need to be adjusted, reduced, or omitted in patients with liver disease or biliary obstruction.

Manganese sulfate and manganese chloride preparations contain aluminum and may reach toxic levels with prolonged parenteral administration if kidney function is impaired. Premature neonates are particularly at risk because their kidneys are immature, and they require large amounts of calcium and phosphate solutions, which also contain aluminum. Patients with impaired kidney function, including premature neonates, who receive parenteral levels of aluminum at greater than 4 to 5 mcg/kg/day accumulate aluminum at levels associated with central nervous system and bone toxicity. Tissue loading may occur at even lower rates of administration. Caution is advised in patients with renal impairment, particularly in premature or neonates patients.

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.

Ascorbic acid is removed by dialysis.