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To help your doctor and pharmacist give you the best care, be sure to tell your doctor and pharmacist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products) before starting treatment with this product. While using this product, do not start, stop, or change the dosage of any other medicines you are using without your doctor's approval.

Some products that may interact with this drug include: drugs that affect the bone marrow (such as chloramphenicol), vitamins/supplements that contain intrinsic factor.

Certain medications can decrease the absorption of vitamin B12, including: colchicine, metformin, extended-release potassium products, antibiotics (such as gentamicin, neomycin, tobramycin), anti-seizure medications (such as phenobarbital, phenytoin, primidone), medications to treat heartburn (such as H2 blockers including cimetidine/famotidine, proton pump inhibitors such as omeprazole/lansoprazole).

Vitamin B12 is an ingredient found in many combination vitamin and nutritional products. Tell your doctor or pharmacist if you are taking other products that contain cyanocobalamin, vitamin B12, or hydroxocobalamin.

Cyanocobalamin may interfere with certain laboratory tests (including intrinsic factor, blood tests for other types of anemia), possibly causing false test results. Make sure laboratory personnel and all your doctors know you use this drug.

Certain drugs may interfere with laboratory tests for vitamin B12 levels, possibly causing false results. Tell laboratory personnel and all your doctors if you take any of the following: antibiotics (such as amoxicillin, erythromycin), methotrexate, pyrimethamine.

This document does not contain all possible drug interactions. Keep a list of all the products you use. Share this list with your doctor and pharmacist to lessen your risk for serious medication problems.

OVERDOSE: If overdose is suspected, contact a poison control center or emergency room immediately. US residents can call the US National Poison Hotline at 1-800-222-1222. Canada residents can call a provincial poison control center.

NOTES: Keep all regular medical and laboratory appointments.

Laboratory and/or medical tests (such as vitamin B12 levels, complete blood count, blood potassium levels) may be performed to monitor your progress or check for side effects. Consult your doctor for more details.

Remember that it is best to get your vitamins and minerals from food whenever possible. Eat a well-balanced diet, and follow any dietary guidelines as directed by your doctor. Foods rich in vitamin B12 include meat, poultry, shellfish, eggs, milk, and other dairy products.

MISSED DOSE: If you miss a dose, take it as soon as you remember. If it is near the time of the next dose, skip the missed dose and resume your usual dosing schedule. Do not double the dose to catch up.

STORAGE: This product is usually stored at room temperature between 59-86 degrees F (15-30 degrees C) away from light and moisture. Do not store in the bathroom. Different brands of this medication may have different storage needs. Check the product package for specific instructions on how to store your brand, or ask your pharmacist. Keep all medications and herbal products away from children and pets.

Do not flush medications down the toilet or pour them into a drain unless instructed to do so. Properly discard this product when it is expired or no longer needed. Consult your pharmacist or local waste disposal company for more details about how to safely discard your product.

Information last revised May 2011 Copyright(c) 2011 First DataBank, Inc.