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First Injection Quick intramuscular injection in the upper arm, thigh, or gluteal area typically less than 10 minutes

Seek urgent same-day assessment or call 999 for emergency care if experiencing: Severe chest pain Severe shortness of breath Fainting or collapse Acute or rapidly worsening neurological deficits (such as new limb weakness, sudden gait disturbance, or bladder/bowel dysfunction) Persistent or worsening anaemia symptoms despite treatmentincluding breathlessness, chest discomfort, palpitations, or extreme fatigueshould trigger medical review

This staggered introduction allows you to identify which compound causes any new side effects rather than guessing

Generic cyanocobalamin is sourced from manufacturers that meet applicable regulatory standards