If you have an autoimmune disorder called pernicious anemia (PA) that causes your body to fail in making sufficient amounts of red blood cells, your doctor can prescribe Hydroxocobalamin generic or brand to help increase your level of B12. This vitamin is usually found in your diet, unless you are a vegan; but the intestines of those with PA are unable to absorb vitamin B12 due to the inability to produce a certain protein that binds to red blood cells in order to be absorbed. Hydroxocobalamin is an injectable form of vitamin B12. Your doctor or other health professional can instruct you on the proper way to inject Hydroxocobalamin at home. The generic alternative is not manufactured by the company that makes the brand product.