how long will b12 injection last Does a Last? UK Treatment Guide – Bolt Pharmacy B12 Injections for Energy: Benefits

Tiredness / lethargy Depression Hair loss Pins & needles Numbness in the hands or feet Tremors or palsies Palpitations Recurrent headaches Dizziness Slower digestion / weight gain Irritability Mood swings Confusion Forgetfulness Fogginess Psychosis Hallucinations or delusion Anxiety/Panic attacks Onset of dementia Hormonal imbalances or worsened menopause symptoms What are contra-indications to having Vitamin B12 intramuscular injections

According to British Society for Haematology (BSH) guidelines and NICE Clinical Knowledge Summaries (CKS), the primary beneficiaries include: Key patient groups who may require B12 injections include: Pernicious anaemia patients requiring lifelong hydroxocobalamin 1mg intramuscularly every 23 months following initial loading doses Patients with gastrointestinal disorders including those who have undergone gastrectomy or ileal resection, and patients with conditions affecting B12 absorption such as Crohn's disease or coeliac disease Strict vegans and vegetarians though oral supplementation is usually sufficient unless malabsorption is present Elderly patients who may have reduced gastric acid production affecting B12 absorption Patients taking certain medications including metformin (MHRA advises monitoring B12 levels in long-term users, particularly those with risk factors or symptoms), proton pump inhibitors, and H2-receptor antagonists long-term [6] Individuals with neurological symptoms such as paraesthesia, ataxia, or cognitive impairment related to B12 deficiency Pregnant women with confirmed deficiency (hydroxocobalamin for malabsorption

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this is not very common, but if it happens, sitting or lying down for a few minutes post-injection can help