Mecobalamin and famciclovir can be taken together, and taking them together usually does not produce side effects or affect the effectiveness of the drug. However, the condition of different patients is different, the use of drugs should be under the guidance of the doctor, do not blindly take. Methylcobalamin is a derivative of vitamin B12, clinically used to deal with neuropathy, is a variety of peripheral neuropathy auxiliary treatment, such as numbness, sensory abnormalities, facial neuritis and other diseases, patients should be taken under the guidance of a doctor. Methylcobalamin tablets is a prescription drug, need to be prescribed according to the specific condition to take, do not blindly take on their own. Clinically, a small number of patients have gastrointestinal discomfort, skin rash and other adverse reactions, note that for methylcobalamin allergic patients should not be used. Famciclovir is an antiviral drug mainly used for the treatment of herpes zoster. Common adverse reactions include nausea, headache, etc. A few patients also have symptoms such as rash and fever. It should not be used by people who are allergic to this type of medication, children, pregnant as well as breastfeeding people. Mecobalamin and famciclovir can be taken together, one is a nutritive neurological drug and the other is an antiviral drug, and there is no interaction between the drugs. However, under the premise of eliminating contraindications, under the guidance of the doctor for drug treatment, do not take the drug on their own.