<unk>  is a manufactured form of vitamin used to treat vitamin deficiency. The deficiency may occur in pernicious anemia, following surgical removal of the stomach, with fish tapeworm, or due to bowel cancer. It is less preferred than hydroxocobalamin for treating vitamin deficiency. It is used by mouth, by injection into a muscle, or as a nasal spray.<unk>  is generally well tolerated. Minor side effects may include diarrhea and itchiness. Serious side effects may include anaphylaxis, low blood potassium, and heart failure. Use is not recommended in those who are allergic to cobalt or have Leber's disease. Vitamin is an essential nutrient meaning that it cannot be made by the body but is required for life.<unk>  was first manufactured in the 1940s. It is available as a generic medication and over the counter. In 2019, it was the 155th most commonly prescribed medication in the United States, with more than 4million prescriptions.
Cyanocobalamin
Hydroxocobalamin
Sodium thiosulfate 
Dimethyl methylphosphonate
Acetylcysteine
Selenium disulfide
Disufenton sodium
Fomepizole