Vitamin B12 (Cobalamin)   Supplements with Similar Uses View List by Use   Drugs that Interact Summary Phenobarbital Phenobarbital-containing Medications Phenytoin Phenytoin-containing Medications Tetracycline Tetracycline-containing Medications   Drugs that Deplete this Substance View List   Learn More About Nutrition	Look Up > Supplements > Vitamin B12 (Cobalamin) > Depletions Drugs that Deplete Vitamin B12 (Cobalamin) Antibiotic Medications Antibiotic Combination: Sulfa Drugs Co-Trimoxazole Trimethoprim-Sulfamethoxazole Cephalosporin Antibiotics Cefprozil Cefuroxime Loracarbef Macrolide Antibiotics Azithromycin Clarithromycin Erythromycin, Systemic Penicillin Derivatives Amoxicillin Amoxicillin and Clavulanate Potassium Penicillin V Potassium Quinolone Antibiotics Cinoxacin Ciprofloxacin Enoxacin Gatifloxacin Levofloxacin Lomefloxacin Moxifloxacin Nalidixic Acid Norfloxacin Ofloxacin Sparfloxacin Trovafloxacin Tetracycline Derivatives Doxycycline Minocycline Tetracycline Antidiabetic Medications Biguanide Agent Metformin Cardiovascular Medications Electrolytes Potassium Chloride Corticosteroids Inhalant, Systemic, and Topical Preparations Beclomethasone Budesonide Dexamethasone Fluticasone Hydrocortisone Methylprednisolone Mometasone Furoate Prednisone Triamcinolone Gastrointestinal Medications Histamine H2 Antagonists Cimetidine Famotidine Nizatidine Ranitidine Bismuth Citrate Ranitidine Hydrochloride Proton Pump Inhibitors Lansoprazole Omeprazole Oral Contraceptives Monophasic, Biphasic, and Triphasic Preparations Ethinyl Estradiol and Desogestrel Ethinyl Estradiol and Levonorgestrel Ethinyl Estradiol and Norethindrone Ethinyl Estradiol and Norgestimate