It is used in the treatment and prevention of vitamin B12 deficiency in patients with conditions such as:_ Addisonian (pernicious) anemia Malabsorption Atrophic gastritis Prolonged treatment with metformin Small bowel bacterial overgrowth (SIBO) Total or partial gastrectomy Infection with the fish parasite Diphyllobothrium latum Helicobacter pylori infection Pancreatic dysfunction Pancreatic or bowel malignancy Dietary deficiency (e.g

Warning signs that need medical attention Seek medical evaluation within 24 to 48 hours if you experience: Redness that continues expanding beyond 48 hours after injection Redness diameter exceeding 10 centimeters Increasing pain (not decreasing) after 48 hours Warmth and hardness accompanied by fever above 100.4 F (38 C) Pus, drainage, or fluid oozing from the injection site Red streaks extending outward from the injection site (sign of lymphangitis) Reaction that has not shown any improvement after 7 days Seek emergency medical care immediately if you experience: Hives or rash spreading beyond the injection site to other body areas Swelling of the face, lips, tongue, or throat Difficulty breathing, wheezing, or shortness of breath Dizziness, lightheadedness, or feeling faint Rapid heartbeat Severe abdominal pain These emergency symptoms suggest a systemic allergic reaction (anaphylaxis), which is rare but documented with tirzepatide

Activities such as strenuous exercise should be avoided for a few days
B12 injections are administered like any other injection, typically in the thickest part of the upper arm muscles