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Hydroxocobalamin 1mg intramuscular injections are prescription-only medicines in the UK, indicated for confirmed B12 deficiency or malabsorption conditions such as pernicious anaemia
Wilson, P
Allergic Reactions: While uncommon, some individuals may experience allergic reactions to the injection, which can include itching, rash, or difficulty breathing
Episodes that last several hours or happen every day need to be checked out
Last reviewed: May 31, 2026 Last updated: May 31, 2026 Written by: Jay Hastings, CEO of PlexusDx Jay Hastings is the CEO of PlexusDx, a precision health company focused on genetic testing, blood biomarker insights, and personalized wellness recommendations
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