This site uses cookies. By continuing to browse the site you are agreeing to our policy on the use of cookies. Find out more here.

eMC - trusted, up to date and comprehensive information about medicines
Link to eMC medicine guides website
eMC homepage
New eMC coming June 2013...

Amdipharm Mercury Company Limited

No. 1 Croydon, 12 - 16 Addiscombe Road, Croydon, Surrey, CR0 0XT, UK
Telephone: +44 (0)208 588 9100
Fax: +44 (0)208 686 0807
Medical Information Direct Line: 08700 70 30 33
Medical Information e-mail:
Customer Care direct line: +44 (0)208 588 9273
Medical Information Fax: +44 (0)208 686 0807

Before you contact this company: often several companies will market medicines with the same active ingredient. Please check that this is the correct company before contacting them. Why?

Summary of Product Characteristics last updated on the eMC: 06/12/2012
SPC Hydroxocobalamin Injection BP 1mg/ml

Go to top of the page
1. Name of the medicinal product

Hydroxocobalamin 1mg/ml Solution for Injection

Go to top of the page
2. Qualitative and quantitative composition

Active Substance


Reference Standard

Hydroxocobalamin Acetate

1.04 mg

Ph Eur

equivalent to



1.00 mg


An overage of 7.5% has been incorporated

Go to top of the page
3. Pharmaceutical form

Solution for Injection

Go to top of the page
4. Clinical particulars

Go to top of the page
4.1 Therapeutic indications

Addisonian pernicious anaemia. Prophylaxis and treatment of other macrocytic anaemias associated with vitamin B12 deficiency. Tobacco amnblyopia and Leber's optic atropy

Go to top of the page
4.2 Posology and method of administration

Route of Administration

Intramuscular injection

Dosage and Administration

The following dosage schemes are suitable for adults and children.

Addisonian pernicious anaemias and other macrocytic anaemias without neurological involvement.

Initially 250 to 1000 micrograms intramuscularly on alternate days for one or two weeks, then 250 micrograms weekly until the blood count is normal

Maintenance: 1000 micrograms every two to three months

Addisonian pernicious anaemia and other macrocytic anaemias with neurological involvement

Initially:1000 micrograms on alternate days as long as improvement is occurring.

Maintenance:1000 micrograms every two of three months.

Prophylaxis of macrocytic anaemia associated with vitamin B12 deficiency resulting from gastrectomy, some malabsorption syndromes and strict vegetarianism

1000 micrograms every two or three months.

Tobacco amblyopia and Leber's optic atrophy

Initially:1000 micrograms or more daily by intramuscular injection for two weeks then twice weekly as long as improvement is occurring.

Maintenance: 1000 micrograms monthly.

Go to top of the page
4.3 Contraindications

Hypersensitivity to any ingredient in the preparation.

Go to top of the page
4.4 Special warnings and precautions for use

The dosage schemes given above are normally satisfactory, but regular examination of the blood is advisable.

If megaloblastic anaemia fails to respond ,folate metabolism should be investigated. Doses in excess of 10 micrograms daily may produce a haematological response in patients with folate deficiency. Indiscriminate administration may mask the true diagnosis.

Cardiac arrhythmias secondary to hypokalaemia during initial therapy have been reported. Plasma potassium should therefore be monitored during this period.

Go to top of the page
4.5 Interaction with other medicinal products and other forms of interaction

Chloramphenicol-treated patients may respond poorly to Hydroxocobalamin injection.

Serum concentrations of hydroxocobalamin may be lowered by oral contraceptives.

The above interactions are unlikely to have clinical significance.

Antimetabolites and most antibiotics invalidate Vitamin B12 assays by microbiological techniques.

Go to top of the page
4.6. Pregnancy and lactation

Hydroxocobalamin injection should not be used for the treatment of megaloblastic anaemia of pregnancy.

Go to top of the page
4.7 Effects on ability to drive and use machines

None Known.

Go to top of the page
4.8 Undesirable effects

Itching, exanthema, chills, fever, hot flushes, nausea, and dizziness and exceptionally anaphylaxis.

Acniform and bulbous eruptions have been reported rarely.

Go to top of the page
4.9 Overdose

Treatment is unlikely to be required in the case of overdosage.

Go to top of the page
5. Pharmacological properties

Go to top of the page
5.1 Pharmacodynamic properties

Hydroxocobalamin is extensively bound to specific plasma proteins. it is absorbed from the gastro-intestinal tract, but may be irregularly absorbed when given in large therapeutic doses and absorption is impaired in patients with an absence of intrinsic factor, with a malabsorption syndrome or with disease or abnormality of the gut, or after gastrectomy.

Hydroxocobalamin is stored in the liver, excreted in the bile, and undergoes some enterohepatic recycling, part of the dose is excreted in the urine, most of it in the first 8 hours. Hydroxocobalamin diffuses across the placenta.

Go to top of the page
5.2 Pharmacokinetic properties

An intramuscular injection of hydroxocobalamin produced higher serum levels than the same dose of cyanocobalamin and these levels are well maintained.

Go to top of the page
5.3 Preclinical safety data

Not applicable.

Go to top of the page
6. Pharmaceutical particulars

Go to top of the page
6.1 List of excipients

Glacial acetic acid Ph Eur

Sodium chloride Ph Eur

Water for injection Ph Eur

Go to top of the page
6.2 Incompatibilities

None known.

Go to top of the page
6.3 Shelf life

The proposed shelf life is 24 months.

Go to top of the page
6.4 Special precautions for storage

Store at or below 25°C. Protect from light.

Go to top of the page
6.5 Nature and contents of container

Type I glass ampoules in cardboard box.

5 ampoules per pack.

Go to top of the page
6.6 Special precautions for disposal and other handling


Go to top of the page
7. Marketing authorisation holder

Mercury Pharmaceuticals Ltd

No. 1 Croydon,

12-16 Addiscombe Road,

Croydon CR0 0XT, UK

Go to top of the page
8. Marketing authorisation number(s)

PL 12762/0008

Go to top of the page
9. Date of first authorisation/renewal of the authorisation

18 August 1997

Go to top of the page
10. Date of revision of the text


More information about this product

Link to this document from your website:

Active Ingredients/Generics