Methycobal Injection is a prescription medication containing 500 micrograms of mecobalamin (Vitamin B12) per ampule. Manufactured by Eisai Co., Ltd. in Japan, it comes in a package of 10 ampules and is administered through injection to treat vitamin B12 deficiency and related conditions. Each ampule contains 500 micrograms of mecobalamin. The product is manufactured and marketed by Eisai Co., Ltd. from Tokyo, Japan. The solution comes in a box containing 10 ampules of 1ml each. The package includes a 'rip to open' feature for easy access. This is a prescription medication that should only be administered under proper medical supervision.