Side effects of methylcobalamin tablets include loss of appetite, nausea, vomiting, diarrhea, etc. Methylcobalamin tablets are contraindicated for those who are allergic to this drug. Methylcobalamin tablets side effects, common gastrointestinal reactions, such as loss of appetite, nausea, severe cases may appear vomiting or mild diarrhea symptoms, usually after stopping the drug symptoms will gradually disappear. Methylcobalamin tablets contraindication, generally speaking, methylcobalamin tablets contraindication for allergy is prohibited, serious cases may also lead to patients with decreased blood pressure, dyspnea and other allergic symptoms, once an adverse reaction should immediately stop using the drug, and promptly go to the hospital. Methylcobalamin tablets belong to the regulation of nerve drugs, mainly used for the treatment of peripheral neuropathy, clinical application is more widely used, when the drug is taken, in addition to the dosage according to the doctor’s instructions, must also pay attention to some of the precautions on the use of the drug, try to avoid adverse reactions, if there are adverse reactions to go to the hospital as soon as possible.