This information is intended for use by health professionals
Neo-Cytamen 1000 micrograms/ml solution for injection
Hydroxocobalamin 1000 micrograms/ml solution for injection
Hydroxocobalamin chloride 1.027mg equivalent to 1.0 mg Hydroxocobalamin.
For excipients, see 6.1
Solution for injection.
Addisonian pernicious anaemia.
Prophylaxis and treatment of other macrocytic anaemias associated with vitamin B12 deficiency.
Tobacco amblyopia and Leber's optic atrophy.
Route of administration: Intramuscular.
Adults and Children
Addisonian pernicious anaemia and other macrocytic anaemias without neurological involvement:
Initially: 250 to 1000mcg intramuscularly on alternate days for one to two weeks, then 250mcg weekly until the blood count is normal.
Maintenance: 1000mcg every two to three months.
Addisonian pernicious anaemia and other macrocytic anaemias with neurological involvement:
Initially: 1000mcg on alternate days as long as improvement is occurring.
Maintenance: 1000mcg every two months.
Prophylaxis of macrocytic anaemia associated with vitamin B12 deficiency resulting from gastrectomy, some malabsorption syndromes and strict vegetarianism:
1000mcg every two to three months.
Tobacco amblyopia and Leber's optic atrophy:
Initially: 1000mcg or more daily by intramuscular injection for two weeks. Then twice weekly as long as improvement is occurring.
Maintenance: 1000mcg monthly.
Hypersensitivity to any ingredient of the preparation.
Neo-Cytamen should not be used for treatment of megaloblastic anaemia of pregnancy unless vitamin B12 deficiency has been demonstrated.
The dosage schemes given above are usually satisfactory, but regular examination of the blood is advisable. If megaloblastic anaemia fails to respond to hydroxocobalamin, folate metabolism should be investigated. Doses in excess of 10mcg daily may produce a haematological response in patients with folate deficiency. Indiscriminate administration may mask the true diagnosis. The haematological and neurological state should be monitored regularly to ensure adequacy of therapy. Cardiac arrhythmias secondary to hypokalaemia during initial therapy have been reported. Plasma potassium should therefore be monitored during this period. Platelet count should be monitored during the first weeks of use in megaloblastic anaemia due to the possible occurrence of reactive thrombocytosis.
Chloramphenicol-treated patients may respond poorly to Neo-Cytamen. Serum concentrations of hydroxocobalamin may be lowered by oral contraceptives but this interaction is unlikely to have clinical significance. Antimetabolites and most antibiotics invalidate vitamin B12 assays by microbiological techniques.
Neo-Cytamen should not be used for the treatment of megaloblastic anaemia of pregnancy unless vitamin B12 deficiency has been demonstrated. Neo-Cytamen is secreted into breast milk but this is unlikely to harm the infant, and may be beneficial if the mother and infant are vitamin B12 deficient.
The following effects have been reported and are listed below by body system:
Blood and lymphatic system disorders
Reactive thrombocytosis can occur during the first weeks of use in megaloblastic anaemia.
Arrhythmias secondary to hypokalaemia.
Disorders of the immune system:
Hypersensitivity reactions including skin reactions (e.g. rash, itching) and exceptionally anaphylaxis.
Gastro intestinal disorders:
Nausea, vomiting, diarrhoea.
Fever, chills, hot flushing, dizziness, malaise, pain. Injection site reactions including injection site pain, injection site erythema, injection site pruritus, injection site induration, and injection site swelling.
Headache, sensory abnormalities such as paraesthesiae.
Renal and unrinary disorders:
Skin and subcutaneous tissue disorders:
Acneiform and bullous eruptions.
Reporting of suspected adverse reactions
Reporting suspected adverse reactions after authorisation of the medicinal product is important. It allows continued monitoring of the benefit/risk balance of the medicinal product. Healthcare professionals are asked to report any suspected adverse reactions via Yellow Card Scheme Website www.mhra.gov.uk/yellowcard or search for MHRA Yellow Card in the Google Play or Apple App Store.
Treatment is unlikely to be needed in cases of overdosage.
Neo-Cytamen contains Hydroxocobalamin, one of the forms of vitamin B12.
An intramuscular injection of hydroxocobalamin produces higher serum levels than the same dose of cyanocobalamin, and these levels are well maintained.
After injection of hydroxocobalamin, 90% of a 100 microgram dose and 30% of a 1000 microgram dose are retained. 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. Vitamin B12 is stored in the liver, excreted in the bile, and undergoes extensive enterohepatic recycling; part of an administered dose is excreted in the urine, most of it in the first 8 hours; urinary excretion, however, accounts for only a small fraction in the reduction of total body stores acquired by dietary means. Vitamin B12 diffuses across the placenta and also appears in breast milk.
Sodium chloride, acetic acid, Water for Injections.
Protect from light. Do not store above 25°C.
1ml clear, one-point cut (OPC) glass Type 1 Ph Eur ampoules packed in cartons of 5 ampoules
RPH Pharmaceuticals AB
101 32 Stockholm
14/10/1992 / 21/01/2004