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Chloramphenicol may impair the haematological response to B12 therapy

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People with low B12 may experience: Persistent fatigue or low energy Weakness Brain fog, concentration issues, or memory changes Low mood or irritability Pins and needles, numbness, or nerve-type sensations Mouth ulcers or a sore tongue Paleness or shortness of breath (if anaemia is present) Some symptoms can become more serious if deficiency is prolonged, particularly neurological symptoms

You can obtain it from pharmacies, medical supply stores, or online retailers that require a prescription or have specific licensing for its sale