when to use this drug and what are the advantages of using it ## This is not a drug, it is a supplement, it contains B complex vitamins. They are vital to our health, if this site doesn't have enough of them for too long of a time period, it can cause serious medical problems. If you have a medical problem that may be caused by being deficient in them, restoring them to your body might help resolve the problem. Read more: Were these prescribed for you?