If you are taking the over-the-counter product to self-treat, follow all directions on the product package before taking this medication. If you have any questions, consult your pharmacist. If your doctor has directed you to take this medication, take as directed by your doctor.

Take this medication by mouth with or without food as directed by your doctor or the product package, usually once daily. Use this product regularly to get the most benefit from it. To help you remember, take it at the same time each day.

The dosage is based on your medical condition, response to treatment, and lab tests. Consult your doctor or pharmacist for more details.

There are many brands and forms of cyanocobalamin (vitamin B12) available. Read the dosing instructions carefully for each product because the amount of cyanocobalamin (vitamin B12) may be different between products.

If you are using the liquid form of this medication, carefully measure the dose using a special measuring device/spoon. Do not use a household spoon because you may not get the correct dose. Some liquid brands may require you to shake the bottle well before each dose.

If you are taking the extended-release tablets, do not crush or chew them. Doing so can release all of the drug at once, increasing the risk of side effects. Swallow the tablets whole.

If you are taking the chewable tablet, chew the medication thoroughly before swallowing.

If you are taking the rapidly-dissolving tablets, dissolve in the mouth with or without water as directed by your doctor or the product package.

Vitamin C (ascorbic acid) can decrease the amount of vitamin B12 you absorb. Avoid taking large doses of vitamin C within one hour before or after taking this product.

If your condition lasts or gets worse, or if you think you may have a serious medical problem, get medical help right away.