Methycobal Injection is a prescription medication containing 500μg of mecobalamin (Vitamin B12) per 1ml ampoule. Manufactured by Eisai Co., Ltd. in Japan, it comes in a package of 10 ampoules and is used to treat Vitamin B12 deficiency and related neurological conditions. Each ampoule contains 500μg of mecobalamin, which is a form of Vitamin B12. The product is manufactured and marketed by Eisai Co., Ltd. from Tokyo, Japan. The ampoules are designed with a 'rip to open' mechanism for easy access. This injectable form of Vitamin B12 may be prescribed when oral supplementation is not sufficient or appropriate. As this is a prescription medication, it should only be used under medical supervision.