Immunoglobulin is a class of proteins used by the immune system. Your body naturally produces immunoglobulin proteins. But to answer the question; yes you can receive a variety of immunoglobulins as a "medication"; they may be synthetic (recombinant proteins) or isolated from other people.
I actually tried to find some information about this for you. I went onto www.ask.com and I typed in Immunoblobulin A and it gave me a whole host of websites. Good luck:)
Bence Jones proteins are small proteins (light chains of immunoblobulin) found in the urine. Testing for these proteins is done to diagnose and monitor multiple myeloma and other similar diseases.