In the US - Call your doctor for medical advice about side effects. If you notice other effects not listed above, contact your doctor or pharmacist. This is not a complete list of possible side effects. However, seek immediate medical attention if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/ tongue/throat), severe dizziness, trouble breathing. Get medical help right away if you have any very serious side effects, including: symptoms of heart failure (such as shortness of breath, swelling ankles/feet, unusual tiredness, unusual/ sudden weight gain).Ī very serious allergic reaction to this drug is rare. Seek immediate medical attention if any of these rare but very serious symptoms occur: chest pain (especially with shortness of breath), weakness on one side of the body, sudden vision changes, trouble speaking. People who have a rare blood disorder ( polycythemia vera) may rarely have symptoms related to this disorder while taking cyanocobalamin. Tell your doctor right away if any of these unlikely but serious side effects occur: muscle cramps, weakness, irregular heartbeat. This medication may cause low potassium levels in the blood ( hypokalemia). Many people using this medication do not have serious side effects. Remember that this medication has been prescribed because your doctor has judged that the benefit to you is greater than the risk of side effects. If any of these effects last or get worse, tell your doctor or pharmacist promptly. Taking an extra dose of cyanocobalamin tablets is unlikely to harm you.Pain/redness at the injection site, mild diarrhea, itching, or a feeling of swelling all over the body may occur. You could also ask your pharmacist for advice on other ways to help you remember to take your medicine. If you forget your tablets often, it may help to set an alarm to remind you. Never take extra tablets to make up for forgotten ones. Never take more than your usual number of tablets at one time. In this case just leave out the missed dose and take your next one as normal. If you forget to take cyanocobalamin tablets, take your usual dose as soon as you remember, unless it’s nearly time for your next dose. Your doctor may want to increase or decrease your dose of cyanocobalamin tablets depending on the level of vitamin B12 in your blood. You may also have regular blood tests to monitor the levels of vitamin B12 in your blood. To see how well your tablets are working, your doctor may ask you about symptoms such as tiredness and lack of energy. This means at least 2 hours after a meal or snack and at least 30 minutes before you eat again.įor cyanocobalamin supplements that you buy, follow the instructions that come in the packet. It’s usually best to take the tablets on an empty stomach. Swallow prescribed cyanocobalamin tablets whole with a drink of water. If you are taking supplements that you have bought, follow the dosage instructions that come with them. B12 deficiency not caused by your diet is one to two 1,000 microgram tablets, taken once or twice a day – this is usually if you cannot have vitamin B12 injections.diet-related deficiency is 50 micrograms to 150 micrograms, taken once a day.Your doctor or pharmacist will advise you on what dose to take. The amount of cyanocobalamin you need depends on the level of vitamin B12 in your blood and why your levels are low. They come in different strengths from 10 to 1,000 micrograms (μg). These come as tablets, capsules, mouth sprays and drops. You can also buy cyanocobalamin B12 supplements from pharmacies, supermarkets and health food shops. If your doctor prescribes vitamin B12 injections, they will usually give you hydroxocobalamin, another type of vitamin B12. These come as 50 and 1,000 microgram (μg) tablets.Ĭyanocobalamin also comes as injections, but these are generally not available on the NHS. an infection in your stomach or intestineĬyanocobalamin tablets are available on prescription.swelling (inflammation) in your intestines because of conditions like Crohn’s disease and coeliac disease. low stomach acid due to swelling (inflammation) in the lining of the stomach (atrophic gastritis) or certain medicines.Some conditions or treatments can stop you absorbing enough vitamin B12 from the food you eat. This can happen if you are vegan or you do not eat much meat or dairy products. You can get it from your food or supplements, but sometimes there may not be enough vitamins in what you eat. Your body requires vitamin B12 to make red blood cells. It’s used to treat and prevent vitamin B12 deficiency anaemia (when you have low levels of this vitamin in your body). Cyanocobalamin is a manufactured version of vitamin B12.
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