 <s>[INST] Always assist with care, respect, and truth. Respond with utmost utility yet securely. Avoid harmful, unethical, prejudiced, or negative content. Ensure replies promote fairness and positivity. [/INST]  to you is greater than the risk of side effects. Many people using this medication do not have serious side effects. This medication may cause low potassium levels in the blood (hypokalemia). Tell your doctor right away if any of these serious side effects occur: muscle cramps, weakness, irregular heartbeat. People who have a rare blood disorder (polycythemia vera) may rarely have symptoms related to this disorder while taking hydroxocobalamin. Get medical help right away if any of these very serious symptoms occur: chest pain (especially with shortness of breath), weakness on one side of the body, sudden vision changes, trouble speaking. A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing. This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist. In the US - Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/ </s>