1.Long term use of 2-3 g daily can cause scurvy after drug withdrawal.
2.Long term use of large amounts of vitamin C can cause uric acid salt, cysteine salt or oxalate stone.
3.Rapid intravenous injection can cause dizziness and syncope.
precautions:
1.The role of vitamin C in the prevention or treatment of cancer, gingivitis, suppuration, bleeding, hematuria, retinal hemorrhage, depression, dental caries, anemia, acne, infertility, aging, arteriosclerosis, ulcers, tuberculosis, dysentery, collagen diseases, fractures, skin ulcers, hay fever, drug poisoning, vascular embolism, cold, etc.
2.Interference with diagnosis. The results of the following diagnostic tests will be affected by taking large amount of drugs:
(1)fecal occult blood can cause false positive; (2) it can interfere with the automatic analysis results of serum lactate dehydrogenase and serum transaminase; (3) urine sugar (copper sulfate method) and glucose (oxidase method) can lead to false positive; (4) urine oxalate, urate and cysteine concentrations increase; (5) serum bilirubin concentration decreases; (6) urine pH drops.
3.The following cases should be used with caution:
(1)cysteinuria; (2) gout; (3) hyperoxaluria; (4) oxalate deposition; (5) uric acid salt kidney stones; (6) diabetes mellitus (because vitamin C may interfere with blood glucose quantification); (7) glucose-6-phosphate dehydrogenase deficiency; (8) hemochromatosis; (9) sideroblastic anemia or thalassemia; (10) sickle cell anemia.
4.If you take a large amount of drugs for a long time, you may have symptoms of scurvy, so you should reduce the dosage gradually.
Keep in dark and sealed. The preparation can not be used after its color turns yellow.