Methylcobalamin is not recommended for lumbar muscle strain because it is not effective. Lumbar muscle strain refers to aseptic inflammation of the soft tissues of the lumbar muscles, fascia, ligaments and other soft tissues as a result of chronic injuries, and is one of the common causes of low back pain, which is usually due to prolonged engagement in heavy physical labor, sports, as well as sedentary and standing for a long time. The common symptoms are pain in the lower back and limitation of activities. The treatment of lumbar muscle strain includes general treatment, medication and physical therapy such as acupuncture and massage. Lumbar muscle strain should pay attention to bed rest, reduce bending activities, and strengthen the lumbar warmth. Drug treatment is mainly for the symptoms of low back pain due to lumbar muscle strain, oral non-steroidal anti-inflammatory drugs, such as ibuprofen extended-release capsules, diclofenac sodium extended-release tablets and so on. And methylcobalamin has the role of nutritional nerve, mainly used in the treatment of peripheral neuropathy, such as diabetic peripheral neuropathy, but also can be used to repair damaged nerves, such as cerebral hemorrhage, cerebral infarction or lumbar intervertebral disc herniation and other diseases. When the symptoms of lumbar muscle strain are serious, it is recommended to seek medical treatment in time and carry out reasonable treatment under the guidance of doctors, and not to blindly deal with or use medication by oneself, so as not to cause adverse consequences.