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18 As Thakkar and Billa, they point out potential concerns for smokers, but again this is based on an article from 1970

Aftercare : You might feel a slight pinch or warmth at the injection site, but this usually fades quickly

Key B12 PFS 1500 mcg Injection 1 ml may cause dizziness

Depending on the severity of your B12 deficiency and your bodys unique response to the treatment, improvements in your symptoms may be noticeable within hours or days of your injection

People with certain conditions, such as liver disease or a weak immune system, should use caution

NICE guidelines recommend hydroxocobalamin 1 mg intramuscularly three times weekly for 2 weeks (without neurological involvement) or on alternate days until no further improvement (with neurological symptoms)