GMP Ascorbic Acid(VC) Injection prevention and treatment of scurvy, or other conditions requiring vitamin C supplement
1. Name of the medicinal product
Ascorbic Acid Injection BPC 500mg/5ml
2. Qualitative and quantitative composition
Ascorbic Acid 10.0% w/v
For excipients, see 6.1
3. Pharmaceutical form
Solution for Injection
4. Clinical particulars
4.1 Therapeutic indications
The prevention and treatment of scurvy, or other conditions requiring vitamin C supplementation, where the deficiency is acute or oral administration is difficult.
4.2 Posology and method of administration
Route of Administration: Parenteral
Adults
0.5 to 1g daily for scurvy, 200 to 500mg daily for preventative therapy.
Children
100 to 300mg daily for curative purposes, or 30mg daily for protective treatment.
Elderly
No special dosage requirements have been suggested.
4.3 Contraindications
Hyperoxaluria
4.4 Special warnings and precautions for use
Ascorbic acid should be given with care to patients with underlying renal failure due to the risk of formation of renal oxalate calculi. Tolerance may be induced in patients taking high doses.
Large doses of Ascorbic Acid have resulted in haemolysis in patients with glucose-6-phosphate dehydrogenase (G6PD) deficiency.
4.5 Interaction with other medicinal products and other forms of interaction
It has been reported that concurrent administration of ascorbic acid and fluphenazine has resulted in decreased fluphenazine plasma concentrations.
Ascorbic acid is a strong reducing agent and interferes with numerous laboratory tests based on oxidation - reduction reactions. Specialised references should be consulted for specific information on laboratory test interferences caused by ascorbic acid.
Ascorbic acid given in addition to desferrioxamine in patients with iron overload to achieve better iron excretion may worsen iron toxicity, particularly to the heart, early on in the treatment when there is excessive tissue iron. Therefore it is recommended that in patients with normal cardiac function ascorbic acid should not be given for the first month after starting desferrioxamine. Ascorbic acid should not be given in conjunction with desferrioxamine in patients with cardiac dysfunction.
Aspirin can reduce the absorption of ascorbic acid by approximately a third and decreases urinary excretion by about half. The clinical importance of this is uncertain.
Patients with kidney failure given aluminium antacids and oral citrate can develop a potentially fatal encephalopathy due to marked rise in blood aluminium levels. There is evidence that vitamin C may interact similarly.
Oral contraceptives lower serum levels of ascorbic acid.
4.6 Fertility, pregnancy and lactation
Ascorbic acid in doses greater than 1g daily should not be taken during pregnancy since the effect of large doses on the foetus is unknown. Ascorbic acid is excreted in breast milk, but there is no evidence of any hazard.
4.7 Effects on ability to drive and use machines
Ascorbic acid injection is unlikely to affect the patient's ability to drive or use machinery.
4.8 Undesirable effects
Large doses may cause gastrointestinal disorders including diarrhoea. Large doses may also result in hyperoxaluria and renal oxalate calculi may form if the urine becomes acidic. Doses of 600mg or more daily have a diuretic action. Induced tolerance with prolonged use of large doses can result in symptoms of deficiency when intake is reduced to normal.
4.9 Overdose
Large doses may cause gastrointestinal disorders including diarrhoea. Large doses may also result in hyperoxaluria and renal oxalate calculi may form if urine is acidic. Doses of 600mg or more daily have a diuretic action. Stop treatment and treat symptomatically.
5. Pharmacological properties
5.1 Pharmacodynamic properties
ATC Code: A11G A01
Ascorbic acid, a water-soluble vitamin, is essential for formation of collagen and intercellular material, and therefore necessary for the development of cartilage, bone, teeth and for the healing of wounds. It is also essential for the conversion from folic acid to folinic acid, facilitates iron absorption from the gastro-intestinal tract and influences formation and erythrocyte maturation.
5.2 Pharmacokinetic properties
Distribution - widely distributed in body tissues with about 25% bound to plasma proteins. Large amounts are present in leucocytes and platelets. Ascorbic acid crosses the placenta.
Metabolism - readily oxidised to dehydroascorbic acid where some is metabolised to oxalic acid and the inactive ascorbate - 2 - sulphate. Metabolic turnover appears to be greater in females than males.
Excretion - large doses are rapidly excreted in the urine when in excess of the requirements of the body and after an intravenous dose, about 40% is excreted in 8 hours, which is increased to about 70% after tissue saturation. The amount of unchanged drug is dose dependent; in women the excretion of ascorbic acid appears to vary with the stage of the menstrual cycle and it is decreased when taking oral contraceptives.
Ascorbic acid is excreted in breast milk.
Oxalic acid and ascorbate - 2 - sulphate are excreted in the urine.
5.3 Preclinical safety data
None stated
6. Pharmaceutical particulars
6.1 List of excipients
Sodium Bicarbonate
Sodium Metabisulphite
Water for injections
6.2 Incompatibilities
Incompatible with ferric salts, oxidising agents, and salts of heavy metals, particularly copper.
6.3 Shelf life
24 months
6.4 Special precautions for storage
Do not store above 25°C
6.5 Nature and contents of container
5ml neutral glass (Type 1) ampoules. Pack size - 10.
6.6 Special precautions for disposal and other handling.
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