What is MagneBind 400 Rx used for and what are its active ingredients? ## Hi barbara, MagneBind 400 is a prescription strength magnesium, calcium, & folic acid combination, used for treating or preventing low levels of folic acid and minerals in certain patients. Unfortunately I could not locate any other specific details on the medication, for it seems it's just marketed as a multivitamin and mineral supplement. I hope this info helps to answer your question!