Some of the most commonly reported methylcobalamin side effects include itching, rash, or diarrhea. Headache, fever, or vomiting may also occur when taking this supplement. Most of the side effects of methylcobalamin are mild, although a doctor should be consulted if symptoms are persistent or become particularly bothersome. Side effects that require immediate medical attention include pain in the lower back or side, difficulty breathing, or facial swelling. Any individualized questions or concerns about potential side effects of methylcobalamin should be discussed with a doctor or other medical professional.
Methylcobalamin, more commonly referred to as vitamin B-12, is naturally found in foods such as meat, dairy products, and seafood. This vitamin may also be taken as a nutritional supplement and is safe for most people as long as the recommended daily amount is not exceeded. In some cases, a person may experience methylcobalamin side effects. Most of these side effects are mild, but medical evaluation is recommended because some of the possible side effects can be fatal.
Abdominal bloating,vomiting, or diarrhea are common methylcobalamin side effects. While these symptoms may occur at normal doses, they are more common when an excessive amount of vitamin B-12 has been consumed. Headaches or a low-grade fever may also be a side effect of taking methylcobalamin. A rash that may or may not itch is another potential side effect, although this is more common when using beauty products such as lotion that contain vitamin B-12 than with an oral supplement.
Anaphylaxis is a medical term used to describe a severe and potentially life-threatening allergic reaction and is among the possible methylcobalamin side effects. Although a rash is a common side effect of this vitamin, if hives develop or the rash is accompanied by other symptoms, it should be treated as a medical emergency. Chest tightness or discomfort may be present along with swelling of the face, lips, or throat. Breathing may become difficult, and the patient may become confused or lose consciousness.
It is important for anyone who is scheduled for a medical procedure such as an angioplasty to let the doctor know if methylcobalamin is being taken. The doctor will most likely advise the patient to stop taking this supplement due to potentially life-threatening side effects. Methylcobalamin is contained in the intravenous fluids used during surgery, and an overdose could occur if a vitamin B-12 supplement is being taken. This medication may not be able to be taken following surgery due to the risks of developing a narrowing of the blood vessels.