The drug methylcobalamin tablets can be used in many departments, with neurology being the most used and most widely used. Mecobalamin tablets are a kind of nerve-nourishing drug, mainly used for the treatment of peripheral nerve diseases. Among the diseases commonly used in neurology departments, there are the following diseases: multiple peripheral neuropathies, Grimballi syndrome, diabetic peripheral neuropathy, uremic peripheral neuropathy and idiopathic facial nerve palsy. All of these diseases are caused by various causes of peripheral nerve damage, mainly using methylcobalamin tablets, all of which have the effect of promoting nerve myelin repair and axon regeneration. There are also rehabilitation, orthopedics and neurosurgery, which often use methylcobalamin tablets. Rehabilitation is mainly applied to cervical spondylosis and lumbar disc herniation, orthopedics is also the same disease spectrum, and neurosurgery is mostly used for repair after nerve damage caused by various reasons.