The best source for top-level information about specific treatments for multiple myeloma is the National Cancer Institute (NCI). It maintains and regularly updates a comprehensive list of FDA-approved, commonly used medications for the treatment of multiple myeloma.

The International Myeloma Foundation (IMF) has a set of “Tip Cardsabout treatments that provide especially useful and concise summaries.

In addition, the major Multiple Myeloma foundations all have excellent information about myeloma treatments on their websites.
 HealthTree
International Myeloma Foundation (IMF)
Multiple Myeloma Research Foundation (MMRF)