You can then try every three days
More serious side effects are rare but can occur
It's frustrating, and it's avoidable
Vitamin B12 Medicine Interactions Chloramphenicol: bacteriostatic antibiotic can interfere with red blood cell response to supplemental Vit B12 Proton pump inhibitors: omeprazole and lansoprazole, etc., slow gastric acid release and may interfere with VIt B12 absorption from food H2-receptor antagonists: cimetidine, famotidine and ranitidine slow the release of hydrochloric acid into the stomach and interfere with Vitamin B12 absorption from food Metformin: might reduce absorption of Vitamin B12 due to altered intestinal motility, increased bacterial overgrowth, etc
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[9] The most frequently observed adverse reactions are mild injection-site pain, transient erythema, and localized warmth, typically resolving within minutes