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Drug
Vitamin
Alcohol
Folate
Thiamin
Vitamin B6
Antacids
Vitamin B12
Antibiotics, such as isoniazid, tetracycline, and trimethoprim-sulfamethoxazole
B vitamins
Vitamin K
Anticoagulants, such as warfarin
Vitamin E
Antiseizure drugs, such as phenytoin and phenobarbital
Biotin
Vitamin D
Antipsychotic drugs
Riboflavin
Barbiturates such as phenobarbital
Chemotherapy drugs, such as methotrexate
Cholestyramine
Vitamin A
Corticosteroids
Vitamin C
Cycloserine
Hydralazine
Levodopa
Mineral oil (long-term use)
Metformin
Nitrous oxide (repeated exposure)
Oral contraceptives
Penicillamine
Phenothiazines
Primidone
Rifampin
Sulfasalazine
Thiazide diuretics
Triamterene
Tricyclic antidepressants, such as amitriptyline and imipramine