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HYDROXOCOBALAMIN 1000MICROGRAM/ML INJECTION
Active substance(s): HYDROXOCOBALAMIN / HYDROXOCOBALAMIN / HYDROXOCOBALAMIN
NAME OF THE MEDICINAL PRODUCT
Hydroxocobalamin 1000 microgram/ml Injection
QUALITATIVE AND QUANTITATIVE COMPOSITION
Anhydrous hydroxocobalamin 1000mcg/ml.
Treatment of Addisonian pernicious anaemia.
Prophylaxis and treatment of other macrocytic anaemias due to vitamin B12 deficiency.
Treatment of tobacco amblyopia.
Treatment of Leber’ s atrophy.
Posology and method of administration
The following dosages are suitable for children and adults.
Addisonian pernicious anaemia and other macrocytic anaemias without neurological
250 micrograms to 1000 micrograms intramuscularly on
alternate days for one or two weeks then 250 micrograms
weekly until blood count is normal.
1000 micrograms every two or three months.
Addisonian pernicious anaemia and other macrocytic anaemias with neurological
1000 micrograms on alternate days
1000 micrograms every two months.
Prophylaxis of macrocytic anaemias associated with vitamin B12 deficiency resulting from
gastrectomy, ileal resection, certain ma/absorption states and vegetarianism:
1000 micrograms every two or three months.
Tobacco amblyopia and Leber’s optic atrophy:
1000 micrograms daily by intramuscular injection for two
weeks then twice weekly as long as improvement is
1000 micrograms every three months or as required.
Sensitivity to hydroxocobalamin / vitamin B12.
Special warnings and precautions for use
This medicine should not be given before a megaloblastic marrow has been demonstrated.
Regular monitoring of the blood is advisable. Doses of hydroxocobalamin greater than 10
micrograms daily may produce a haematological response in patients with folate deficiency.
Indiscriminate use may mask the exact diagnosis. Cardiac arrhythmias secondary to
hypokalaemia have been reported during initial therapy and plasma potassium should,
therefore, be monitored during this period.
Interaction with other medicinal products and other forms of interaction
The serum concentration of hydroxocobalamin may be reduced by concurrent administration
of oral contraceptives.
Chlorphenicol-treated patients may respond poorly to
hydroxocobalamin. Vitamin B12 assays by microbiological techniques are invalidated by
antimetabolites and most antibiotics.
Pregnancy and lactation
Hydroxocobalamin should not be used to treat megaloblastic anaemia of pregnancy.
Effects on ability to drive and use machines
The following effects have been reported and are listed below by body system:
Disorders of the immune system:
Allergic hypersensitivity reactions
Gastro intestinal disorders:
Frequency Not Known: Nausea
Frequency Not Known: Fever, dizziness, Injection site disorders
Frequency Not Known: Headache
Treatment is unlikely to be needed in cases of overdosage.
ATC classification: B03B A03
Vitamin B12 is extensively bound to specific plasma proteins called transcobalamins;
transcobalamin II appears to be involved in the rapid transport of the cobalamins to tissues.
It is stored in the liver, excreted in the bile, and undergoes enterohepatic recycling; part of a
dose is excreted in the urine, most of it in the first 8 hours.
Preclinical safety data
There are no pre-clinical data of relevance to the prescriber which are additional to that
already included in other sections of the Summary of Product Characteristics.
List of excipients
Sodium dihydrogen orthophosphate
Sodium Hydroxide (for pH adjustment)
Hydrochloric Acid (for pH adjustment)
Water for Injections
Special precautions for storage
Protect from light. Store below 25°C.
Nature and contents of container
This medicine is supplied in clear 1ml Type I glass ampoules in cartons of 5 or 10.
Special precautions for disposal
MARKETING AUTHORISATION HOLDER
Amdipharm UK Limited
Capital House, 85 King William Street,
London EC4N 7BL, UK
MARKETING AUTHORISATION NUMBER(S)
DATE OF FIRST AUTHORISATION/RENEWAL OF THE
18th June 1993 / 6th November 1998
DATE OF REVISION OF THE TEXT
Source: Medicines and Healthcare Products Regulatory Agency
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