Common side effects include: Injection site reactions mild pain, redness, swelling, or bruising at the injection site, typically resolving within a few days Headache usually transient and manageable with standard analgesia Nausea or dizziness particularly in the initial treatment phase Skin reactions including itching, mild rash, or acneiform eruptions Temporary urine discolouration red or orange urine is harmless and expected Diarrhoea or flushing usually mild and self-limiting In patients with severe megaloblastic anaemia, low potassium levels (hypokalaemia) may occur during initial intensive treatment, but this is uncommon in routine maintenance therapy
This makes it much safer than fat-soluble vitamins that can build up in your system
Frequency: Follow the prescribed regimen which may start with frequent administrations (e.g., daily or weekly) before transitioning to a maintenance schedule (e.g., monthly)
Some important points about B12 intramuscular dose standards include: The typical dosage range is between 100-1,000 mcg, with 1,000 mcg being the most common for intramuscular injections