Ascorbic acid is the active ingredient of Vitamin C tablets. Vitamin C is used for prevention and treatment of scurvy.

• Hypersensitivity to the active substance or to any of the excipients of the drug.
• Ascorbic acid should not be given to patients with hyperoxaluria.

Warnings and precautions
Talk to your doctor or pharmacist before taking Vitamin C tablets:

• Increased intake of ascorbic acid over a prolonged period may result in an increase in renal
  clearance of ascorbic acid and deficiency may result if it is withdrawn rapidly.
• Ascorbic acid may interfere with tests and assays for urinary glucose, giving false-negative
  results with methods utilising glucose oxidase with indicator (e.g. Labstix, Tes-Tape) and falsepositive results with neocuproine methods.
• Estimation of uric acid by phosphotungstate or uricase with copper reduction and measurement
  of creatinine in non-deproteinised serum may also be affected.
• High doses of ascorbic acid may give false-negative readings in faecal occult blood tests.
• Patients with rare hereditary problems of galactose intolerance, total lactase deficiency or
  glucose-galactose malabsorption should not take this medicine.

Other medicines and Vitamin C Tablets
Tell your doctor or pharmacist if you are taking, have recently taken or might take any other medicines. This is particularly important if you are taking any of the following:

• Ascorbic acid increases the renal excretion of amphetamine. The plasma concentration of
  ascorbate is decreased by smoking and oral contraceptives.
• Ascorbic acid increases the absorption of iron.
• Concomitant administration of aspirin and ascorbic acid may interfere with absorption of
  ascorbic acid. Renal excretion of salicylate is not affected and does not lead to reduced antiinflammatory effects of aspirin.
• Concomitant administration of aluminium-containing antacids may increase urinary aluminium
  elimination. Concurrent administration of antacids and ascorbic acid is not recommended,
  especially in patients with renal insufficiency.
• Co-administration with amygdalin (a complementary medicine) can cause cyanide toxicity.
• Concurrent administration of ascorbic acid with desferrioxamine enhances urinary iron
  excretion. Cases of cardiomyopathy and congestive heart failure have been reported in patients with idiopathic haemochromatosis and thalassaemias receiving desferrioxamine who were subsequently given ascorbic acid. Ascorbic acid should be used with caution in these patients and cardiac function monitored.
• Ascorbic acid may interfere with biochemical determinations of creatinine, uric acid and glucose in samples of blood and urine.
  If you need to have a blood or urine test you should tell the doctor or nurse you are taking these tablets as they may interfere with the results.

Like all medicines, this medicine can cause side effects, although not everybody gets them.
You should see your doctor if you experience any side effect.
Nervous system disorders: headache.
Vascular disorders: flushing.
Gastrointestinal disorders: nausea, vomiting and stomach cramps. Large doses of ascorbic acid
may cause diarrhoea.
Skin and subcutaneous tissue disorders: redness of skin.
Renal and urinary disorders: Patients known to be at risk of hyperoxaluria should not ingest
ascorbic acid doses exceeding 1g daily as there may be increased urinary oxalate excretion.
However, such risk has not been demonstrated in normal, non-hyper oxaluric individuals.
Ascorbic acid has been implicated in precipitating haemolytic anaemia in certain individuals
deficient of glucose-6-phosphate dehydrogenase.
Increased intake of ascorbic acid over a prolonged period may result in increased renal clearance
of ascorbic acid, and deficiency may result if the intake is reduced or withdrawn rapidly. Doses
of more than 600mg daily have a diuretic effect.

• Do not use this medicine after the expiry date which is stated on the carton or label. The expiry date refers to the last day of that month.
• Store at a temperature (15-25ºC), in а place, protected from moisture and out of the reach of children and. Protect from light.
• Shelf life – 2 years. Do not use after the expiration date.

Do not throw away any medicines via wastewater or household waste. Ask your pharmacist how to throw away medicines you no longer use. These measures will help protect the environment.