Methylcobalamin is suitable for the treatment of peripheral neuropathy, cerebellar atrophy can not produce the therapeutic effect of taking this drug, the specific use of medication should follow the doctor’s instructions. First of all, it should be clear that methylcobalamin is a nutritive nerve drug, suitable for the treatment of peripheral neuropathy (such as trigeminal neuralgia, Guillain-Barré syndrome, etc.). This drug is prohibited for people who are allergic to it, and nausea, diarrhea and other adverse reactions may occur during the use of the drug. The disease of microcephaly, on the other hand, mainly affects the maintenance and regulation of somatic balance, muscle tone, and random movement, leading to symptoms such as ataxia, dysarthria, and hypotonia. Therefore, methylcobalamin does not produce a relieving effect on the symptoms related to microcephaly, and patients with this disease cannot produce a therapeutic effect by taking methylcobalamin. To summarize, people with cerebellar atrophy generally do not use methylcobalamin for treatment, people diagnosed with this disease must be under the guidance of a doctor for the use of medication and other therapeutic options, do not dispose of their own, blind use of medication, in order to avoid inappropriate interventions, resulting in adverse consequences.